A textbook of obstetrics . a-uterine amputations. A de-veloping limb may be caughtbetween two of these bands,and as it grows may be so con-stricted that the distal portionof the limb is entirely cut oiTfrom its blood-supply. .Adhe-sions may also be formed be-tween various portions ni thebody and the amniotic coveringof the placenta, or the umbilicalcord may be artificially shortened by the adhesions of coils oneto another and to the fetal In the latter part of pregnancy the amnion may burst, theintegrity of the ovum being preserved by the Thefetus then, by its active movements
A textbook of obstetrics . a-uterine amputations. A de-veloping limb may be caughtbetween two of these bands,and as it grows may be so con-stricted that the distal portionof the limb is entirely cut oiTfrom its blood-supply. .Adhe-sions may also be formed be-tween various portions ni thebody and the amniotic coveringof the placenta, or the umbilicalcord may be artificially shortened by the adhesions of coils oneto another and to the fetal In the latter part of pregnancy the amnion may burst, theintegrity of the ovum being preserved by the Thefetus then, by its active movements, can roll the amnion up intocords, which may become so entangled with the umbilical cordas to constrict it sufficiently to obliterate its blood-vessels. Cysts of the Amnion.—Cases of cystic formations in thesubstance of the amnion have been reported by Ahlfeld, Winc- 1 Leopold, F5tus mil Verklebungen der Nabelschnur, etc., ;>,. Bd. m, 383. 51 !,i.,. der, I ehrbw h, 8tb <•<!., p. . Fig. 74.—Amniotic bands hesive bands ; d, e, feet; f, g, genitaliaand anus. THE C1IORIOX. IO3 kel, and They are small and have no clinical signifi-cance. After the death of the fetus the amnion undergoescertain changes, resulting in a loss of its glistening surface andin a considerable thickening. The histology of this change isnot known. THE CHORION, When the ovule first drops into the uterine cavity and be-comes imbedded in folds of the thickened uterine mucous mem-brane, the protoplasmic cell-wall of the ovum sends out numerousprolongations, which serve to fix the egg in its position, and
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Keywords: ., bookcentury1800, bookdecade1890, bookidtex, booksubjectobstetrics
