Talk:Book - A Very Young Ovum In Situ

From Embryology


CONTENTS

PAGE

Introduction - - 5-g

Consideration of the Reconstruction of the Ovum From

Section 1 to 160 - 10-33

CHAPTER

I. The Mucosa Elevation, which Harbors the Ovum,

and the Decidua Vera - - 34-42

II. The Embedding of the Ovum. The Capsularis.

The Fibrinous Cover ("Gewebspilz" of Peters) 42-51

III. The "Eianlage" and the Ovular Chamber.

("Eikammer") 51-54

IV. The Trophoblast and its Surrounding Blood Spaces.

The Intervillous Circulation 54-64

V. The Syncytium 64-66

Explanation of Figures 67-69

Consideration of the Reconstruction of the Ovum from Sections 1-160

(Table requires formatting)

No. of Section.

Mucous i

Without fibrin cover.

nembrane elevation narbonn

With fibrin cover.


y the ovum.

Epithelium above.


Epithelium beneath?

I.

3

4


like i and 3. 6.


The mucous membrane protuberance which later be comes the ovular elevation, encircled by epithelium.

7

Mucous membrane becomes thicker.


Epithelium varying in thickness.

8.


Epithelium varying in thickness.


Q.


The well preserved surfact which a large g over the elevat


epithelium in

land opens passes ion.


IO.


Suddenly a thin fibrin cover appears over elevation ("Gewebspilz" Peters'.)

Under which a trace of surface epithelium is to be seen.


II.

Firbin cover increases in thickness toward right.


Over fibrin cover epithelium varying in thickness.


Not clear.


12.

Present.


Blood vessels.


Glands.


Eianlage.


Illustration.


No. of Section.


In the small elevation on the surface of the mucous membrane, glands and capillaries plentiful; glands with perfect epithelium.

i.

Capillaries already considerably dilated.

Glands as in i.


3

Numerous capillaries in elevation of mucous membrane surface.


Greatly dilated glands with perfectly preserved epithelium.


Fig- 3

4


like i and 3. 6.


Blood and capillaries present.


No glands in summit of ovular elevation. Dilated gland in depth of section.


Here the first suspicion of Eianlage by presence of syncytial cells. Accumulation of leucocytes.


7

Dilated capillaries in elevation and communicating bl< ed with syncytial c


X)d spaces infiltrat,ells.


Scattered syncytial cells, accumulation of leucocytes.



8.


Blood spaces in elevation, whose intervening walls contain fibrin.


A large gland opens into elevation on the same well preserved surface epithelium.


Scattered syncytial cells. Tissue of elevation somewhat infiltrated with blood.



Q.


In the mound confluent vessel spaces.



Infiltrated with trophoblast processes with a layer of syncytial covering.


Fig. 4.


10.


Capillaries become dilated in elevation.


Glands in elevation and surrounding, numerous and plainly visible. .


The inner blood space in the ovular elevation surrounded with syncytial cells.



1 1.


Blood spaces as in 1 1.




Mucous membrane elevation harboring the ovum.


No. of



Section.


Without fibrin cover.


With fibrin cover.


Epithelium above.


Epithelium beneath?


14.



Present.







Band of epi

To the left and





thelium on


under the fibrin





the fibrin


covering sur

15



Present.


cover which


face epithelium.





sinks into the right somewhat





swollen end of the fibrin cover





like the mouth


of a gland.






Instead of as






above, there is


1 6.



Present.



found only a





slight funnel-like depression of





tissue cells anc


blood cells.






Still somewhat


'7



Present.


of a funnel-like depression of tis




sue cells.







Somewhat of a




"



depression cov

1 8.



An entirely structureless



ered with epi



mass.



thelial-like






cells.






To the left un





der the fibrin






cover, epithe

iQ.



' "


funnel-like dep


lium present, ression still pres




ent. In it or rather between it





and the fibrin cover many blood





cells.







Under the fibrin




Present.



cover a long






epithelial like






band, which




At certain parts aggrega

probably originates from the


20.



tion of leucocytes. Oc

syncytial offshoots which closely




casionally large syncy

approach the fibrin cover and




tial cells, but without a


may easily be mistaken for uter



nucleus.


ine epithelium.



Blood vessels.


Glands.


Eianlage.


Illustration.


No. of Section.





Trophoblast with syncytial offshoots. Blood present.



14.


Decidual cells between the dilated capillaries and glands.


Processes of trophoblast with offshoots.


Fig- 5

15







1 6.





At the periphery of the ovular chamber, syncytial cells found.



>7

On the border of the various capillaries syncytial cells, partly arising from endothelium.






18.


Same.


Numerous elongated and some greatly dilated glands.


Same.


Fig. 6.


19.





Trophoblast with syncytial offshoots pass well up under the fibrin covering.



20.


14 CONSIDERATION OF THE RECONSTRUCTION OF THE OVUM FROM SECTION 1-160.


No. of Section.


Mucous membrane elevation harboring the ovum.


Without fibrin cover.


With fibrin cover.


Epithelium above.


Epithelium beneath?


Present.

Becoming steadily longer and lies like a worm with its thick end on the right of the ovular elevation.


Epithelium varying in thickness on the fibrin cov


An epitheliallike band coming from both sides under the fibrin cover.


Most likely syncytial cells.


23.


24 and 25.


In elongated part, connective tissue arrangement. Leucocytes, and in the club end fibrin only. Between these two parts as well as towards the ovular elevation many red blood cells.


Epithelium Under the fib varying in rin cover long

thickness on streaks of epithe fibrin cov- thelial-like er. cells.

Close on to these the long stretched syncytial cells with large nuclei reach, which come from the trophoblast.


The elongated part becomes more and more organized, the club end is still fibrinous but is already infiltrated with white blood cells.


Epithelium varying in thickness above.


The same.


26.


The fibrin cover becomes Epithelium constantly longer and ' varying in has at its right end a but- thickness, ton-like thickening containing many red blood cells. The left end a structureless elongation. Therefore only the middle part is organized.


As in 23.


27.


Fibrin cover very much elongated, on the right end knob-shaped, folded like a corpus luteum, in the center of fold, blood cells. The left end sends out an offshoot and becomes steadily longer.


Epithelium varying in thickness fi b r i n


An epitheliallike band under fibrin cover. Under the elongated left


o n cover.

end of the fibrin cover this band contains a few cells with a distinct nucleus and under the same, running parallel with it, are seen the large syncytial cells.


28 and 29. same as 27 30.


Fibrin cover as in 27. Blood found in fold of knob end.

At the base of fibrin cover are found syncytial clubs with many nuclei. Close by, an epithelial-like band.


Epithelial-like band to left under fibrin cover. Probably having some connection with the giant syncytial cells.


15


CONSIDERATION OF THE RECONSTRUCTION OF THE OVUM FROM SECTION 1-160.


Blood vessels.


Glands.


Eianlage.


Illustration.


No. of Section.


Vessels dilate, their walls become thinner and rupture. Blood escapes and passes into the neighboring glands.



Eianlage, with projection, now seen cut laterally.


Fig- 7

22.


Endothelium of the capillaries enlarged. Contains large nuclei.


Glands to the side of the ovum may be seen almost in their entire length. Various others filled with blood.


Eianlage has a projection with a broad end. Ovular chamber filled with blood.



23.


"


"


Eianlage with trophoblast buds and projections which anchor themselves in the periphery of the ovular chamber. Projections with trophoblast nuclei and syncytial covering.



24 and 25.


At the broad base the blood vessels become more confluent and take up the protruding trophoblast processes.


To the left and right of ovum excellently preserved, some broken open and filled with blood.


Eianlage, larger and takes on a more definite form.



26.


Toward the ovular chamber the confluent blood vessels are now divided by an arch-like arrangement of fibrin.



Eianlage as in 26, passing from it to the fibrin cover are five trophoblast processes with offshoots of syncytium. In the surrounding of the Eianlage decidual cells.


Fig. 8.


27.


Passing from the Ei blast processes and s free blood, likewise i


anlage to the knob e yncytial offshoots are n the fold of the fibr


Eianlage manifold, elongated and somewhat compressed by free blood, nd of the fibrin cover, trophoseen. Between the offshoots n cover.


Section 26-28. Fig. Q and Fig. 10. Section

3Fig. n.


28 and 29 same as

27.

30.


16


CONSIDERATION OF THE RECONSTRUCTION OF THE OVUM FROM SECTION 1-160.


No. of


Mucous membrane elevation harboring the ovum.


Section.


Without fibrin cover.


With fibrin cover.

1


Epithelium above.


Epithelium beneath?




Between fibrin cover and




3>



periphery of the ovular chamber, many processes of syncytium with many







nuclei.




32.



Between fibrin cover and neighboring border many syncytial giant cells.


Band of epithelium not distinct.


To the right under the fibrin cover, presumably a remnant of epithelium.


33



Present.


Below and above fibrin cover no band of epithelium left.


34



Giant syncytial cells reach to fibrin cover.



Absent.






Only toward and under fib

35


Present.



rin cover are 4 epithelial-like formations.


36.



Present.

Elongated with clubshaped end.



Is similated by rows of epithelial-like syncytial cells.




Present.



Under the knob


37

.


Elongated with knob end, which appears like a thick fibrin band.


Band of varying thickness.


end an epithelial-like band surrounded by blood cells.




The elongated part of the fibrin cover here resem



38.



bles some of the previous specimens. The knoblike end is more fibrinous







but is already beginning to be infiltrated with




,



leucocytes.




Blood vessels.


Glands.


Eianlage.


Illustration.


No. of Section.





Tropholbast processes. Coat elevated by blood and consists of two layers. Row of nuclei with syncytial covering.



31




Trophoblast processes with offshoots pass toward periphery, where fibrin cover lies. Coat elevated, 2 layers: Langhans' cells and syncytial covering.


Fig. 12.


32.





Eianlage with partly elevated coat.



33







34

Blood vessels disintegrating.



Processes of trophoblast.



35




Mesoblast and Ectoblast (Trophoblast and Syncytial cells) pass under entire fibrin cover along the wall of the ovular envelope.



36.


Owing to the increasing size of the ovum the sur rounding blood vessels become more and more disintegrated, to the ovum but doe ovular chamber.


To the right and left of ovum two glands. In the middle of these a third gland which gradually dilates and passes s not open into the



Fig. 14.


37



The same.


The syncytial cells pass up to the ovum periphery and make the impression of surface epithelium.



38.


18 CONSIDERATION OF THE RECONSTRUCTION OF THE OVUM FROM SECTION 1-160.


No. of Section.


Mu

Without fibrin cover.


ous membrane elevation har

With fibrin cover.


boring the ovum.

Epithelium above.


Epithelium beneath?


39

the one side of wh arising from the t


Present. Under the long offshoots of the fibrin cover a long blood vessel present, ich consists of broad cells 'ophoblast.


Over the knob end a wormlike cover.



40.

i



The elongated part of the fibrin cover is made up of distinct tissue. The knob end is arranged exactly like a corpus luteum.


Over the knob end a band varying in thickness.


Under the knob end reaching from the border, an epithelial band.


41 like 40.



Same.

Under the entire fibrin cover, large svncy tial cells are seen.





42.



Under the knob end syncytial giant cells.





43



The knob end of the fibrin cover is infiltrated with leucocytes.





45



Under the fibrin cover the row of syncytial cells have become considerably larger.





47

'


Present.





49



Present.


gated syncyti might be mist epithelium.


Under the fibrin cover elonal cells, which aken for surface


5



The knob end becoming shorter and rounder.



Elongated syncytial cells below.


19


CONSIDERATION OF THE RECONSTRUCTION OF THE OVUM FROM SECTION 1-160


Blood vessel.


Glands.


Eianlage.


Illustration.


No. of Section.



Left gland with broad opening. Right gland surro die one which reac with blood.


unds entire ovum. The midhes to the ovum becomes filled


Fig. 13.


39




From the trophoblast an extension of syncytial cells pass to the epithelial-like band on the border under the knob end.



40.





As in 40.



41 like 40.





Covering with syncytial buds.



42.


43

of the ovum can be the entire length tc


The two glands to the right and left followed almost in their openings.


Covering has two rows.



45

A broad part of the contact a double ce visible. Here as in which anchor them;


ovum lies under the 1 row (Langhans* eel 48 one' sees large of elves into the peripri


Processes of trophoblast with offshoots, fibrin cover. At the point of ,s and Syncytium) are plainly "shoots, from the trophoblast, ery of the ovum.


Fig. 1 6.


47




Offshoots with covering which become anchored. (Section 50.)



49

In the periphery of the ovum toward the middle of the mucosa uteri, an enormously dilated vessel.



Eianlage with offshoots as heretofore.



5'


20

No. of Section.


Mu

Without fibrin cover.


cous membrane elevation hai

With fibrin cover.


boring the ovum.

Epithelium above.


Epithelium beneath?


52.



Under fibrin cover enormous syncytial cells.





53



The fibrin cover becomes more compressed. (Almost structureless.) Giant syncytial cells below.





54



The knob end rounder and thicker, under the same thick syncytial cells, with many nuclei.





55 and 56.



Under the fibrin cover the syncytial cells constantly increasing in number.





57



Under entire length of fibrin cover larger and smaller syncytial cells are found.


Over knob end of fibrin cover a band of epithelium varying in thickness.



58 and 59.



Fibrin cover compressed, shortened and thickened. Beneath syncytium.





60.


structureless knob has become organi syncytial cells are


The fibrin cover now presents itself as an almost the rest of the fibrin cover zed. Under this cover the constantly multiplying.





6 1 and 62.



Among these syncytial cells trophoblast cells are observed.





63.



The knob end like a button. Under the same rows of syncytium, which pass almost to the outer border of the covering.


Blood vessels.


Glands.


Einlage.


Illustration.


No. of Section.





Band of ectoblast with Langhans' cells and syncytium. In Eianlage peculiarly arranged cells. Embryonic rudiment?


Fig. 26.


52.





Eianlage lies plainly on the periphery with a covering of two layers.



53

The enormously dilated blood vessels as in 51.



Trophoblast processes with syncytium anchored to periphery of ovum.



54







55 and 56.


Dilated capillaries.

well preserved unc due to the confluen Enormously dilated present in 51.


Beautifully arranged, partly ergoing dissolution t blood vessels, blood vessels still


The albuminous mass in the Eianlage compressed by blood in the ovular chamber.



57



To the left and right of ovum, glands with openings.


Eianlage with trophoblast processes and syncytial offshoots.



58 and 59.


The enormously dilated blood vessels divided into three spaces by the decidual tissue.



Eianlage with trophoblast processes. Syncytial covering.


Fig. 17. Fig. 27.


60.



The two glands to the left and right are distinctly visible.


Eianlage, as in 60.



6 1 and 62.



The same.


Eianlage with trophoblast and offshoots.


Fig. 1 8.


63.



No. of Section.


Mu

Without fibrin cover.


cous membrane elevation hai

With fibrin cover.


boring the ovum.

Epithelium above.


Epithelium beneath?


65 and 66.



The knob-like end becomes flatter.

67 and 68.



The knob becomes still flatter and is hardly visible in 68.. Beneath it a layer of syncytium.





69.



The knob but a small structureless fibrinous elevation. Layer of syncytium beneath it.

70-73.



The knob is as 69. Beneath it syncytium, which might be mistaken for uterine surface epithelium.


In 73 a layer of epithelium varying in thickness.



74



The knob as in 73.


As in 73.



75

becomes longer an cover.


The fibrinous structureless mass, which has been but a tiny knob, again d lies on the organized fibrin





76-79.



The fibrinous structureless mass becomes steadily longer. Syncytium is seen beneath this mass.


A band of epithelium varying in thickness.


Similates uterine surface epithelium.


80.

The structureless mass becomes steadily longer and begins to appear as before. (See sections 10-25.)


An epitheliallike band.



Si.








82 and 83.








84.



Fibrin cover with a band lying above it.


A few cells beneath. (Epithelial cells?)


Blood vessels.


Glands.


Eianlage.


Illustration.


No. of Section.








65 and 66.



Glands plainly visible to the right and left.


Eianlage toward the summit with trophoblast.



67 and 68.



Glands plainly visible to the left; to the right they are displaced.


Eianlage with beautiful tropholbast processes and offshoots with syncytium.


Fig. IQ.


69.



The same.


The same.



70-73.





Numerous syncytial cells scattered in the surrounding of the ovum.



74



The same.


Eianlage with trophoblast processes.


Fig. 20.


75




'



76-79.



The same.


The same.


Fig. 21.


80.





Polymorphous and pressed together by Eianlage and ectoblast. The latter arranged like numerous prongs. Trophoblast processes.


(View of

entire ovum.)


81.





Large trophoblast processes with syncytial offshoots extending to the border and walls of the blood vessels.



82 and 83.





Trophoblast processes with syncytium plainly visible, In the periphery of the ovular chamber large syncytial cells.



84.


Section.


Without fibrin cover.


With fibrin cover.


Epithelium above.


Epithelium, beneath?


85.





Under fibrin






cover a chain


86 and 87.



The fibrin cover becomes longer and on its right end has a knob - like thickening.


Epithelium spreading above it.


.of cells (Epithelium?) At the right border a distorted gland. Blood has entered






it.


88.


band a fine layer ol ed syncytial cells c


Fibrin cover larger. Toward the epithelial fibrin is seen;- then elongatccasionally trophoblast.


A long band of epithelium over it.


Under it a torn epithelial band however in better pres




ervation.






Under the fib





rin cover, os

89.



Present.



tensibly an epithelial layer.






Present?


90-92.



Elongated.


Present.


Immediately below it are






biids of syncy





tium.


93



Larger.

4


Epithelium above and beneath the fibrin cover.


94.



Distinct.





95 and 96.



The same.


Present.


Present.


Blood vessels.


Glands.


Eianlage.


Illustration.'


No. of Section.


To the right between the ovular chamber and the adjoining glands new capillaries are constantly being opened.


The large gland to the left of the ovum reaches to the border. The almost in its enti becomes lost th periphery.


inland to the right can be seen re length. The middle gland e nearer it approaches the



85.


Confluent capillaries at the border becoming dissolved.

Also from the endott near the border ol cells are seen prol syncytial cells.


Long glands to the right and left. The middle one does not quite extend to the ovum.

elium of the vessels the ovum cavity, ferating, similating





86 and 87.





The offshoots of a long trophoblast plug radiates toward a vessel.



88.



etrates an adjoin wall has been pen its neighbor. Lar at other places.


The syncytium passes from a trophoblast plug and pening vessel. After the vessel etrated it communicates with ge clusters of syncytial cells



89.



The three glands as in 86 and 87.

border. The sync group of vessels in corroded by two s


Long trophoblast processes with syncytium at the ends. Becomes anchored at the vtium corrodes a vessel. A the border are likewise being yncytial offshoots.


Fig. 28.


90-92.


Vessels in dissolution in the border.


The glands to the right are seen in their entire length. Likewise the left. The middle glands disappear.


Long trophoblast processes anchor with syncytium.


Fig. 22.


93.



The middle gland becomes lost toward the border of the ovum.


Mesodern distinct and polymorphous. At the border large trophoblast plugs with syncytial covering become anchored to the ovum periphery.


94



The middle gland at the border of the ovum with large epithelial cells.


Trophoblast at the border of the ovum (near the fibrin cover) has two hook-like plugs between which is found considerable blood.


Fig. 23.


95 and 96.


26


CONSIDERATION OF THE RECONSTRUCTION OF THE OVUM FROM SECTION 1-160.


No. of


Mucous membrane elevation harboring the ovum.


Section.


Without fibrin cover.


With fibrin cover.


Epithelium above.


Epithelium beneath?


97 and 98.



Fibrin cover has sunk into the underlying tissue.


Bands of epithelium varying in thick

Bands of epithelium.





ness.



99.



Fibrin cover elongated.


Likewise.


Bands of epithelium varying in thick





ness.


100.



Present.


Fibrin strip has a layer of epithelium.


Likewise below.


IOI.



Fibrin cover depressed. To the left epithelium.



Epithelium (?). beneath the fibrin strip.






Under the fib

1 02.


~


Small fibrinous elevation.



rinous elevation, strips of epithelium (?)


103.


Fibrin cover entirely absent.


Only a tiny particle thereof present.



Short bands, (Surface epithelium?)


104 and 105.


Absence of fibrin cover.






1 06 and 107.


The same.



Surface epithelium fairly well preserved.



1 08.


The same.





I 10






and


The same.






in.






27.


CONSIDERATION OF THE RECONSTRUCTION OF THE OVUM FROM SECTION 1-160


Blood vessels.


Glands.


Eianlage.


Illustration.


No. of Section.


cells close to the ov lost however the cl the ovum. To th the left i to 2 glanc


Middle gland has large epithelial um, which become aser they approach

right 2 glands, to

s.


Trophoblast processes with syncytium.



97 and 98.



Three glands.


Trophoblast processes with syncytium.



99.



Three glands. The middle one begins to disappear.


Trophoblast processes. Syncytium reaches to the border.



100.



Three glands.


Beautiful tropholbast processes.



101.



The middle gland is seen plainly reaching to the ovum.


Trophoblast processes reach almost to the border of the ovum. Syncytial buds reach to the under border of fibrinous elevation.



1 02.



The middle glands not so plainly visible.


The trophoblast and syncytium reach to the band beneath the beginning of the fibrin cover.



103.



The middle gland reaches almost to the ovum.



Fig. 24.


104 and 105.



Two new glands are seen on the border of a dilated vessel.


Trophoblast processes with syncytium and giant cells.



106 and 107.


seen. In later sec comes more plainly length.


The end of a large gland is plainly tions this gland bevisible in its entire


Trophoblast processes.



1 08.


Capillary spaces.


The gland very distinct, the opening however has become less distinct. Other glands with their epithelium have become destroyec through hemorrhage.


Buds of syncytium.



I 10

and in.


No. of Section.


M

Without fibrin cover.


ucous membrane elevation ha

With fibrin cover.


rboring the ovum

Epithelium above.


Epithelium beneath?


I 12.


Not a suspicion ol a fibrin cover.






113.


The same.




i 14-1 i 6. 1 17 and 1 1 8.


The same.






IIQ.



A trace of fibrin present.





121

and

122.


Not a trace of fibrin except on ovular elevation.






123.

and 124.


The same.






125-128.



129-131.


132.


133.


Blood



vessel.


Glands.


Eianlage.


Illus

No. of


tration.


Section.


| The mouth of the gland disappears.

In a gland filled with blood, the epithelium cells are swollen, partly enlarged and elevated from base.


Buds of syncytium.


A gland at the border. Close to the pole of the ovum, a gland lined with epithelium and greatly dilated, is seen filled with blood.


113.


Dilated capillaries surround the ovum.


A large long gland close to the ovum


Syncytium anchor.


i 14-1 16 117 and 1 1 8.


The mouths of two glands on top of the ovum.


Delicate processes 'become anchored to the periphery.


119.


Cavernous Wood spaces in the periphery of the ovum.


A gland opening.


Between the cavernous blood spaces the syncytium is arranged in arches.


121 and 122.


Cavernous blood spaces surrounding the ovum.


Many capillaries open in the surrounding of the central blood space.


Two gland openings close to top of the ovum mound.


123 and 124.


To the right of the ovum a gland with a distinct


opening

alone;

capillary.


passes a dilated


The interior of the ovum filled with blood, this is enclosed by arch-like arranged syncytial cells.


125-128.


A number of capil- Glands as in 132. laries open at a place which was previously occupied by the nucleus of the Eianlage and break into discernible glands.


Syncytial cells become less.


In the periphery Still more syncytial cells of the ovular ele- with large well stained nuvation four clei.

glands are plainly visible partly a.) dissolved in capillaries, at their opening or in the center, b.) fairly well traceable in their entire length, c.) not plainly visible, d.) opening not distinct, toward the interior dilation plainly visible.


132.


Capillaries break into glands.


Syncytial cells with large nuclei.


'33


No. of Section.


Mu

Without fibrin cover.


cous membrane elevation hai

With fibrin cover.


boring the ovum.

Epithelium above.


Epithelium beneath?


134-136.


137-I39




140.



141.


142 and 143.


The mucous membrane elevation upon which no fibrin cover is present, shows a few confluent blood spaces in the center, besides this beautiful glands and numerous blood vessels.





144 and 145.




147.





Rests of surface epithelium.



151.


Divided blood spaces in the ovular elevation.





152.


' 5 1 and

55




Surface epithelium present over ovular elevation.




, 31


Blood vessels.


Glands.


Eianlage.


Illustration.


No. of Section.


Syncytial cells between the blood spaces.



Syncytial cells not so numerous.



134-136.


The vessels penetrate the glands.






i 37-' 39

The endothelium of the vessels contain large nuclei, parall lie directly on the v


1 with these a few

essels.





140.


Numerous syncytial cells in the surrounding of thecapillaries.






141.


Greatly dilated.


Four large glands pass through the ovular elevation but much more distinctly visible tl b.) elongated; c. 2


In the center of the mound many syncytial cells and accumulation of leucocytes.

lan in 132. a.) greatly coiled; nd d.) with distinct openings.


Fig. 25.


142 and 143.


Confluent blood spaces in the center of ovular elevation.


Gland spaces and mouths.


A few syncytial cells and accumulation of leucocytes in the surrounding of the central blood spaces.'



144 and 145.


Dilated confluent blood capillaries in the ovular elevation.


Glands dilated. Between them accumulation of leucocytes.





147.


Capillaries greatly dilated.

In the surrounding ol al cells are present.


Likewise the glands.

both many decidu




151.


A few very large syncytial cells with highly stained in the more centr spaces.


nuclei are still found ally located blood





152.


Central blood spaces and with these communicating capillaries.






I5 1 and

155


No. of Section.


Mu

Without fibrin cover.


cous membrane elevation har

With fibrin cover.


soring the ovum.

Epithelium above.


Epithelium beneath?


156.


Fibrin with large ovular elevation.


nuclei passing through the





,58.


In the ovular elevaiton only the borders of the more centrally located blood spaces can be seen.





1 60.


Ovular elevation supplied with enormous capillaries.


Uterine surface epithelium present.


Blood vessels.


Glands.


Eianlage.


Illustration.


No. of Section.



To the left and





157: Centrally large blood spaces.


right glandular spaces partly filled with blood.




156.


,58.


Detached capillaries.


Numerous glands.


It may here be stated that all the microscopic sections have been embedded with the summit of the elevation produced by the ovum, pointing to the right, as in Fig. 2 ; thus the entrance into the furrow formed by the mucous membrane, also opens to the right. In this manner the meaning of the constantly recurring terms "right" and "left" in the description of the sections, is obvious.