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Book - A Laboratory Manual and Text-book of Embryology 2 - Revision history
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Z8600021 at 07:27, 20 April 2013
2013-04-20T07:27:02Z
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 18:27, 20 April 2013</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l12">Line 12:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===Cleavage in Amphioxus===</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===Cleavage in Amphioxus===</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The ovum is essentially isolecithal since it contains but little yolk (Fig. IS). About one hour after fertilization it dixides vertically into two nearly equal daughter cells, or blastomeres. The process is known as cell cleavage y or segmentation, and takes place by mitosis. Within the next hour the daughter cells again cleave in the vertical plane, at right angles to the first division, thus forming four cells. Fifteen minutes later a third division takes place in a horizontal plane. As the yolk is somewhat more abundant at the vegetal pole of the four cells the mitotic spindles lie nearer the animal |X)le. Consequently in the eight-celled stage the upper tier of four cells is smaller than the lower four. By successive cleavages j first in the vertical, then in the horizontal plane a 16- and 32-celled embryo is formed. The upper two tiers are now smaller, and a cavity, the blaslocaU, is enclosed by the <del style="font-weight: bold; text-decoration: none;">celb</del>. The embryo at this stage is «»m(^lime« called a morula <del style="font-weight: bold; text-decoration: none;">fmulbeiry</del>). In subsequent cleavages, as development procccrlft, the size of the cells b diminished while the cavity enlarges (Fig. 15), </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The ovum is essentially isolecithal since it contains but little yolk (Fig. IS). About one hour after fertilization it dixides vertically into two nearly equal daughter cells, or blastomeres. The process is known as cell cleavage y or segmentation, and takes place by mitosis. Within the next hour the daughter cells again cleave in the vertical plane, at right angles to the first division, thus forming four cells. Fifteen minutes later a third division takes place in a horizontal plane. As the yolk is somewhat more abundant at the vegetal pole of the four cells the mitotic spindles lie nearer the animal |X)le. Consequently in the eight-celled stage the upper tier of four cells is smaller than the lower four. By successive cleavages j first in the vertical, then in the horizontal plane a 16- and 32-celled embryo is formed. The upper two tiers are now smaller, and a cavity, the blaslocaU, is enclosed by the <ins style="font-weight: bold; text-decoration: none;">cells</ins>. The embryo at this stage is «»m(^lime« called a morula <ins style="font-weight: bold; text-decoration: none;">L. mulberry</ins>). In subsequent cleavages, as development procccrlft, the size of the cells b diminished while the cavity enlarges (Fig. 15), </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>— CiMi-aitc of (h« tfn of Amphioxus (after Hatschek). X200. 1. Tbe egg before tiie m-rmrnt of ilcvi^lnpmenl; only one polar body, /'.A,, is pr«$«nt. Ih« other having btcD lost <del style="font-weight: bold; text-decoration: none;">duiing oviiUtion</del>, J, The n\-um in the act of dividing, by a vertical cleft, into two equal blastomefes. 3. Stage with four njual blaslomrtts. 4. Sta^r with i-ij^ht bla$tomere»: an upper tier of four slightly amaller ones and a Iiiutt tier of four slightly larj^r ones 5. t^tafie with sixteen bla^lomere? in tno tiers, each of eight. A. StaKC with thiily-twii Ida^iinKirs, in fiiur tiers, each of eishi: the embr\-o is represented bisected to «hii«' the c(e(t\-aj;e cavity or Nastivirle. fi. 7. l^terstaRe; the bla»ton>erc« have increased in number by fiinlier division. S. DUstula sta^e hjsecleil to show the lilastociele, B. </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>— CiMi-aitc of (h« tfn of Amphioxus (after Hatschek). X200. 1. Tbe egg before tiie m-rmrnt of ilcvi^lnpmenl; only one polar body, /'.A,, is pr«$«nt. Ih« other having btcD lost <ins style="font-weight: bold; text-decoration: none;">during ovulation</ins>, J, The n\-um in the act of dividing, by a vertical cleft, into two equal blastomefes. 3. Stage with four njual blaslomrtts. 4. Sta^r with i-ij^ht bla$tomere»: an upper tier of four slightly amaller ones and a Iiiutt tier of four slightly larj^r ones 5. t^tafie with sixteen bla^lomere? in tno tiers, each of eight. A. StaKC with thiily-twii Ida^iinKirs, in fiiur tiers, each of eishi: the embr\-o is represented bisected to «hii«' the c(e(t\-aj;e cavity or Nastivirle. fi. 7. l^terstaRe; the bla»ton>erc« have increased in number by fiinlier division. S. DUstula sta^e hjsecleil to show the lilastociele, B. </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The <del style="font-weight: bold; text-decoration: none;">enil*r\i> </del>is now a N<istui<i. nearly spherical in form and about four hours old, The cleavage of the Amphioxus o\-um is thus holtM<istif. i. e.. compUte. and nearly </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The <ins style="font-weight: bold; text-decoration: none;">embryo </ins>is now a N<istui<i. nearly spherical in form and about four hours old, The cleavage of the Amphioxus o\-um is thus holtM<istif. i. e.. compUte. and nearly </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Fig. 16. — Cleavage of iht !'u^'> ..sclickin MiirshallJ, ity; N, nucleus. ; 21), B, Blaslucirle or cleavage a </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Fig. 16. — Cleavage of iht !'u^'> ..sclickin MiirshallJ, ity; N, nucleus. ; 21), B, Blaslucirle or cleavage a </div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2" class="diff-side-added"></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Fig. 17.— <del style="font-weight: bold; text-decoration: none;">Dbgrann showinf* </del>the cleavage of ihe mammalian (rabbits) <del style="font-weight: bold; text-decoration: none;">o\Tim blastiHiermic </del>vesicle (Allen Thomsitn, nflcr van Bencilcn). </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Fig. 17.— <ins style="font-weight: bold; text-decoration: none;">Diagram showing </ins>the cleavage of ihe mammalian (rabbits) <ins style="font-weight: bold; text-decoration: none;">ovum blastodermic </ins>vesicle (Allen Thomsitn, nflcr van Bencilcn). </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>H C </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>H C </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Vwi 1^ (U^dulrtlionor nmphio\u7« UtiU>Hhck in UcislcrV X220. .4, Blastula: a, animal cells; <del style="font-weight: bold; text-decoration: none;">fi N vH>*t«*M\v \vlU» » t » \ Un»n rtR\' \ rt\ ity. H, Ut^</del>inning in\*n):ination of vcgetath-e pole. C, GastruU, the uu<del style="font-weight: bold; text-decoration: none;"><^4(M{</del>^U\M\ wl tho wni^lrtliNxMvIN Mi\K \vm|4rtr: n7.. ivtvxlerm; rfi/.. entoderm; arcA., aichenteron; </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Vwi 1^ (U^dulrtlionor nmphio\u7« UtiU>Hhck in UcislcrV X220. .4, Blastula: a, animal cells; <ins style="font-weight: bold; text-decoration: none;">??? </ins>inning in\*n):ination of vcgetath-e pole. C, GastruU, the uu^U\M\ wl tho wni^lrtliNxMvIN Mi\K \vm|4rtr: n7.. ivtvxlerm; rfi/.. entoderm; arcA., aichenteron; </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>|H^lo v<n^^philM{0. KATntunUy the invaginatinj; colls obliterate the blastula cavity <del style="font-weight: bold; text-decoration: none;">M\\\ \\\\\w \\\ \\\\\\iW\ </del>with tho oulor layer of ivUs vFig. l^V The new caWty thus Km uh\J iv \ he i^inul ivv ^iut \>r *m Ai^^itihi and its nanxnveil mouth is the blastopore. <del style="font-weight: bold; text-decoration: none;">\\w \^\\W\ la\ev v\t vvH> </del>is the t\:%sirrm, iho innor, ncwlv formed laver is the enio^\- %y Vh\^ ouusKMiual vyH> a«x^ honvvforih \\xiux^mi\l in the nutrition and metab\Nl\>*n\ nM Ov KsU rho on^Mw^ iv lu^w iornu\l a Gasirula . little stomach). </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>|H^lo v<n^^philM{0. KATntunUy the invaginatinj; colls obliterate the blastula cavity <ins style="font-weight: bold; text-decoration: none;">??? </ins>with tho oulor layer of ivUs vFig. l^V The new caWty thus Km uh\J iv \ he i^inul ivv ^iut \>r *m Ai^^itihi and its nanxnveil mouth is the blastopore. <ins style="font-weight: bold; text-decoration: none;">??? </ins>is the t\:%sirrm, iho innor, ncwlv formed laver is the enio^\- %y Vh\^ ouusKMiual vyH> a«x^ honvvforih \\xiux^mi\l in the nutrition and metab\Nl\>*n\ nM Ov KsU rho on^Mw^ iv lu^w iornu\l a Gasirula . little stomach). </div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">K^|M\li^* Ami ttinU. rho j^^vuuual x?isv\ or Wasuviom*,. in these animals lies »0vo .^ X A5^ >v,^ ^iv v\u",axv \M iux^t; w^lk xFxj: .^\ Sinoc the oniMrmous amount of wvK ev^V> V <,wi;*,v.x>^;u^^^\ .^v v.\ Vv,^5^^,^^\us ar*xi ar^'.jxhil^^ur.s in:poiS!5iMe, the process </del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">K^|M\li^* Ami ttinU. rho j^^vuuual x?isv\ or Wasuviom*,. in these animals lies »0vo .^ X A5^ >v,^ ^iv v\u",axv \M iux^t; w^lk xFxj: .^\ Sinoc the oniMrmous amount of wvK us ar*xi ar^'.jxhil^^ur.s in:poiS!5iMe, the process </ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l106">Line 106:</td>
<td colspan="2" class="diff-lineno">Line 104:</td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>In Amphibia the mesodermal diverticula grow out from the dorsal entoderm as solid plates between the ectoderm and entoderm. Later, these plates split into two layers and the cavity so formed gives rise to the coelom.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>In Amphibia the mesodermal diverticula grow out from the dorsal entoderm as solid plates between the ectoderm and entoderm. Later, these plates split into two layers and the cavity so formed gives rise to the coelom.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Fig. 21. — <del style="font-weight: bold; text-decoration: none;">l.ongitui]inal </del>sections oF the snake's blastoderro at various stages to show the origin of the notochordal plate (adapted aFter Hertwig). </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Fig. 21. — <ins style="font-weight: bold; text-decoration: none;">Longitudinal </ins>sections oF the snake's blastoderro at various stages to show the origin of the notochordal plate (adapted aFter Hertwig). </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===Reptiles===</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===Reptiles===</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The same pocket-like depression in the caudal portion of the <del style="font-weight: bold; text-decoration: none;">hlasttxlerm</del>, which gave rise to the cells of the entodermal layer, now invaginates more extensively and forms a jxiuch which pushes in between ectoderm and entoderm (Fig. 21 A and B). The size of the in\'ngination ca\-ity varies in different species; in some it is elongated and narrow, being confined to the middle line of the lilast(xlerni. The tl«*ir of this jxiuch siK>n fuses with the underlying entoderm and the two thin, niplure, and <del style="font-weight: bold; text-decoration: none;">disapix'ar</del>. thus putting the <del style="font-weight: bold; text-decoration: none;">ca%ity </del>of the pouch in communication with the space (archenteron) beneath the entoderm (Fig. 21 C). The cells of the roof persist as the notochordal plate which later gives rise to the notochord. The neural folds arise before the mouth of the pouch (blastopore) closes up, and, fusing to form the neural tube, incorporate the blastopore in its floor. This temporary communication between the neural tube and the primitive enteric cavity is the neurenteric canal (Fig. 21 C); it is found in al the vertebrate groups (cf. Fig. 78). A transverse section through the in vagina ted pouch, at the time of rupture of its floor, and the underlying entoderm will make clear the relatively slight lateral extent of these changes (Fig. 22). </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The same pocket-like depression in the caudal portion of the <ins style="font-weight: bold; text-decoration: none;">blastoderm</ins>, which gave rise to the cells of the entodermal layer, now invaginates more extensively and forms a jxiuch which pushes in between ectoderm and entoderm (Fig. 21 A and B). The size of the in\'ngination ca\-ity varies in different species; in some it is elongated and narrow, being confined to the middle line of the lilast(xlerni. The tl«*ir of this jxiuch siK>n fuses with the underlying entoderm and the two thin, niplure, and <ins style="font-weight: bold; text-decoration: none;">disappear</ins>. thus putting the <ins style="font-weight: bold; text-decoration: none;">cavity </ins>of the pouch in communication with the space (archenteron) beneath the entoderm (Fig. 21 C). The cells of the roof persist as the notochordal plate which later gives rise to the notochord. The neural folds arise before the mouth of the pouch (blastopore) closes up, and, fusing to form the neural tube, incorporate the blastopore in its floor. This temporary communication between the neural tube and the primitive enteric cavity is the neurenteric canal (Fig. 21 C); it is found in al the vertebrate groups (cf. Fig. 78). A transverse section through the in vagina ted pouch, at the time of rupture of its floor, and the underlying entoderm will make clear the relatively slight lateral extent of these changes (Fig. 22). </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l162">Line 162:</td>
<td colspan="2" class="diff-lineno">Line 160:</td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>vne ,t»d llv ,s. ,,i^i,mi(l ti;i,vv in it ,*( .i *■ </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>vne ,t»d llv ,s. ,,i^i,mi(l ti;i,vv in it ,*( .i *■ </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Fig. <del style="font-weight: bold; text-decoration: none;">2,*</del>.— niMtodcrm of a chick cmbij-o I <hc stage of the pnmiiivc siroak and ^w\T \\t> hours). X ». </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Fig. <ins style="font-weight: bold; text-decoration: none;">25</ins>.— niMtodcrm of a chick cmbij-o I <hc stage of the pnmiiivc siroak and ^w\T \\t> hours). X ». </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Fig. M.— llucnm ductdating the fonna(itm tif the <del style="font-weight: bold; text-decoration: none;">primuHv simk </del>(Duval m Heisler). rW in>-rc>sin$ siif tif Htc fxna disc in the v>i«r>* .if iSc ikAvlopment is indicated by dotted! .m-Mlat lincsi. The htav^- lines represent tth- .prs.vnii.- jnw\ic and (he priDiiti\-e streak n hk-h »ri«s iriim it by tlw fusion of the edges </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Fig. M.— llucnm ductdating the fonna(itm tif the <ins style="font-weight: bold; text-decoration: none;">primitive streak </ins>(Duval m Heisler). rW in>-rc>sin$ siif tif Htc fxna disc in the v>i«r>* .if iSc ikAvlopment is indicated by dotted! .m-Mlat lincsi. The htav^- lines represent tth- .prs.vnii.- jnw\ic and (he priDiiti\-e streak n hk-h »ri«s iriim it by tlw fusion of the edges </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>.ill the ivn«lili.>ii </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>.ill the ivn«lili.>ii </div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">... ^^r^y\■ </del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">\\\\ tW lNl..-l.sl.-n </del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>ous with the primitive pit rilxxi lor the less modi&ed </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>ous with the primitive pit rilxxi lor the less modi&ed </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>.Ml- a <del style="font-weight: bold; text-decoration: none;">priniiii\t </del>streak and knot essentially as in birds (Figs. 26 A and 28). Similarly from the keel-like ectodermal thickening of the primitive streak, mesoderm grows out laterally and caudally, and from the primitive knot it is continued cranially as the head process. All three primary germ layers fuse in the primitive streak and knot, this condition being known in man. The head process of many mammalian embryos contains a cavity {notockordal canal), which in some cases is of considerable size, opening at the primitive pit. As in reptiles, the floor of this cavity fuses with the entoderm and the two rupture and disappear. A still persistent portion of the floor is shown in Fig. 27. Thus a neurenteric </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>.Ml- a <ins style="font-weight: bold; text-decoration: none;">primitive </ins>streak and knot essentially as in birds (Figs. 26 A and 28). Similarly from the keel-like ectodermal thickening of the primitive streak, mesoderm grows out laterally and caudally, and from the primitive knot it is continued cranially as the head process. All three primary germ layers fuse in the primitive streak and knot, this condition being known in man. The head process of many mammalian embryos contains a cavity {notockordal canal), which in some cases is of considerable size, opening at the primitive pit. As in reptiles, the floor of this cavity fuses with the entoderm and the two rupture and disappear. A still persistent portion of the floor is shown in Fig. 27. Thus a neurenteric </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l220">Line 220:</td>
<td colspan="2" class="diff-lineno">Line 214:</td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
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https://embryology.med.unsw.edu.au/embryology/index.php?title=Book_-_A_Laboratory_Manual_and_Text-book_of_Embryology_2&diff=101527&oldid=prev
Z8600021 at 02:38, 13 September 2012
2012-09-13T02:38:13Z
<p></p>
<a href="https://embryology.med.unsw.edu.au/embryology/index.php?title=Book_-_A_Laboratory_Manual_and_Text-book_of_Embryology_2&diff=101527&oldid=83651">Show changes</a>
Z8600021
https://embryology.med.unsw.edu.au/embryology/index.php?title=Book_-_A_Laboratory_Manual_and_Text-book_of_Embryology_2&diff=83651&oldid=prev
S8600021 at 20:19, 7 February 2012
2012-02-07T20:19:44Z
<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 07:19, 8 February 2012</td>
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S8600021
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S8600021: Created page with "{{Embryology Manual 1917 TOC}} {{Historic Disclaimer}} =Chapter II. Cleavage and Formation of the Germ Layers= {{Historic Disclaimer}} {{Glossary}} {{Footer}} [[Category..."
2012-02-07T20:18:33Z
<p>Created page with "{{Embryology Manual 1917 TOC}} {{Historic Disclaimer}} =Chapter II. Cleavage and Formation of the Germ Layers= {{Historic Disclaimer}} {{Glossary}} {{Footer}} [[Category..."</p>
<p><b>New page</b></p><div>{{Embryology Manual 1917 TOC}}<br />
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[[Category:Prentiss]]</div>
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