File:Streeter1919-fig02.jpg - Revision history

Z8600021: /* Fig. 2. Topographical relations of the caudal end of the spinal cord in the human fetus from the eighth to the twenty-fifth week */

2019-01-31T12:24:39Z

Fig. 2. Topographical relations of the caudal end of the spinal cord in the human fetus from the eighth to the twenty-fifth week

← Older revision		Revision as of 23:24, 31 Ocak 2019
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	==Fig. 2. Topographical relations of the caudal end of the spinal cord in the human fetus from the eighth to the twenty-fifth week==		==Fig. 2. Topographical relations of the caudal end of the spinal cord in the human fetus from the eighth to the twenty-fifth week==

	Comparison of these stages shows the rate and extent of caudal displacement of the vertebral column, in relation to the telzninal ventricle and the attachment of the sacral nerve roots, which constitute deﬁnite and fixed points on the spinal cord. In each case the dorsal root of the first sacral nerve is drawn in, and the attachment of the dorsal roots of the other sacral nerves is shown by heavy lines. The twenty-fifth to twenty-ninth vertebrae were regarded as sacral vertebrae, irrespective of form, as shown in stipple. The fetuses are listed in the Carnegie Collection follows: No. 75, 30 mm.; No. ~~1656~~, 67 mm.; No. ~~1673~~, 111 mm.; N0. ~~1345~~, 221 mm. The first two are from proﬁle reconstructions, the last two from dissections.		Comparison of these stages shows the rate and extent of caudal displacement of the vertebral column, in relation to the telzninal ventricle and the attachment of the sacral nerve roots, which constitute deﬁnite and fixed points on the spinal cord. In each case the dorsal root of the first sacral nerve is drawn in, and the attachment of the dorsal roots of the other sacral nerves is shown by heavy lines. The twenty-fifth to twenty-ninth vertebrae were regarded as sacral vertebrae, irrespective of form, as shown in stipple. The fetuses are listed in the Carnegie Collection follows: No. {{CE75}}, 30 mm.; No. {{CE1656}}, 67 mm.; No. {{CE1673}}, 111 mm; N0. {{CE1345}}, 221 mm. The first two are from proﬁle reconstructions, the last two from dissections.

			In ﬁgure 2 the specimens are enlarged upon a decreasing scale of magniﬁcation according to age, so that the segments of the different stages are brought to about the same size. This has been done in order to facilitate the comparison of segment levels. The actual elongation of the spinal root of a given nerve is greater, therefore, than would appear from the ﬁgure. Measurements of the dorsal root of the ﬁrst sacral nerve from the margin of the ganglion to the point of entrance into the cord yield the following ﬁgures: 30-mm. fetus, 0.65 mm. long; 67-mm. fetus, 4.75 mm. long; 111-mm. fetus, 12.25 mm. long; 221-mm. fetus, 32 mm. long.

	~~In ﬁgure 2 the specimens are enlarged upon a decreasing~~
	~~scale of magniﬁcation according to age, so that the segments of~~
	~~the different stages are brought to about the same size. This~~
	~~has been done in order to facilitate the comparison of segment~~
	~~levels. The actual elongation of the spinal root of a given nerve~~
	~~is greater, therefore, than would appear from the ﬁgure.~~
	~~Measurements of the dorsal root of the ﬁrst sacral nerve from~~
	the margin of the ganglion to the point of entrance into the cord yield the following ﬁgures: 30-mm. fetus, 0.65 mm. long; 67-mm. fetus, 4.75 mm. long; 111-mm. fetus, 12.25 mm. long; 221-mm. fetus, 32 mm. long.

	{{Streeter1919 figures}}		{{Streeter1919 figures}}

	[[Category:Carnegie Embryo ~~544~~]][[Category:Carnegie Embryo 75]]		[[Category:Carnegie Embryo 1345]][[Category:Carnegie Embryo 75]]
			[[Category:Carnegie Embryo 1673]][[Category:Carnegie Embryo 1656]]
			[[Category:Fetal]]

Z8600021 at 12:22, 31 Ocak 2019

2019-01-31T12:22:58Z

← Older revision		Revision as of 23:22, 31 Ocak 2019
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	{{Streeter1919 figures}}		{{Streeter1919 figures}}

			[[Category:Carnegie Embryo 544]][[Category:Carnegie Embryo 75]]

Z8600021 at 14:04, 11 September 2015

2015-09-11T14:04:40Z

← Older revision		Revision as of 01:04, 12 September 2015
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	Comparison of these stages shows the rate and extent of caudal displacement of the vertebral column, in relation to the telzninal ventricle and the attachment of the sacral nerve roots, which constitute deﬁnite and fixed points on the spinal cord. In each case the dorsal root of the first sacral nerve is drawn in, and the attachment of the dorsal roots of the other sacral nerves is shown by heavy lines. The twenty-fifth to twenty-ninth vertebrae were regarded as sacral vertebrae, irrespective of form, as shown in stipple. The fetuses are listed in the Carnegie Collection follows: No. 75, 30 mm.; No. 1656, 67 mm.; No. 1673, 111 mm.; N0. 1345, 221 mm. The first two are from proﬁle reconstructions, the last two from dissections.		Comparison of these stages shows the rate and extent of caudal displacement of the vertebral column, in relation to the telzninal ventricle and the attachment of the sacral nerve roots, which constitute deﬁnite and fixed points on the spinal cord. In each case the dorsal root of the first sacral nerve is drawn in, and the attachment of the dorsal roots of the other sacral nerves is shown by heavy lines. The twenty-fifth to twenty-ninth vertebrae were regarded as sacral vertebrae, irrespective of form, as shown in stipple. The fetuses are listed in the Carnegie Collection follows: No. 75, 30 mm.; No. 1656, 67 mm.; No. 1673, 111 mm.; N0. 1345, 221 mm. The first two are from proﬁle reconstructions, the last two from dissections.

			In ﬁgure 2 the specimens are enlarged upon a decreasing
			scale of magniﬁcation according to age, so that the segments of
			the different stages are brought to about the same size. This
			has been done in order to facilitate the comparison of segment
			levels. The actual elongation of the spinal root of a given nerve
			is greater, therefore, than would appear from the ﬁgure.
			Measurements of the dorsal root of the ﬁrst sacral nerve from
			the margin of the ganglion to the point of entrance into the cord yield the following ﬁgures: 30-mm. fetus, 0.65 mm. long; 67-mm. fetus, 4.75 mm. long; 111-mm. fetus, 12.25 mm. long; 221-mm. fetus, 32 mm. long.

	{{Streeter1919 figures}}		{{Streeter1919 figures}}

Z8600021: Z8600021 uploaded a new version of File:Streeter1919-fig02.jpg

2015-09-11T13:53:38Z

Z8600021 uploaded a new version of File:Streeter1919-fig02.jpg

← Older revision	Revision as of 00:53, 12 September 2015
(No difference)

Z8600021 at 13:51, 11 September 2015

2015-09-11T13:51:08Z

← Older revision		Revision as of 00:51, 12 September 2015
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			==Fig. 2. Topographical relations of the caudal end of the spinal cord in the human fetus from the eighth to the twenty-fifth week==

			Comparison of these stages shows the rate and extent of caudal displacement of the vertebral column, in relation to the telzninal ventricle and the attachment of the sacral nerve roots, which constitute deﬁnite and fixed points on the spinal cord. In each case the dorsal root of the first sacral nerve is drawn in, and the attachment of the dorsal roots of the other sacral nerves is shown by heavy lines. The twenty-fifth to twenty-ninth vertebrae were regarded as sacral vertebrae, irrespective of form, as shown in stipple. The fetuses are listed in the Carnegie Collection follows: No. 75, 30 mm.; No. 1656, 67 mm.; No. 1673, 111 mm.; N0. 1345, 221 mm. The first two are from proﬁle reconstructions, the last two from dissections.

	{{Streeter1919 figures}}		{{Streeter1919 figures}}

Z8600021 at 13:45, 11 September 2015

2015-09-11T13:45:35Z

← Older revision	Revision as of 00:45, 12 September 2015
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		{{Streeter1919 figures}}

Z8600021 at 13:44, 11 September 2015

2015-09-11T13:44:53Z

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