File:A text-book of embryology for students of medicine (electronic resource) (1907) (20344332672).jpg

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Title: A text-book of embryology for students of medicine (electronic resource)
Identifier: b21286991 (find matches)
Year: 1907 (1900s)
Authors: Heisler, John Clement; Waterstone, David, former owner; Duke-Elder, Stewart, 1898-1978, former owner; University College, London. Library Services
Subjects: Embryology; Embryology
Publisher: Philadelphia : W. B. Saunders Company
Contributing Library: UCL Library Services, University College London (UCL)
Digitizing Sponsor: Jisc and Wellcome Library

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THE ALLANTOIS. 91 The function of the allantois in egg-laying animals, and possibly in some others, is to serve as a nutritive and res- piratory organ and as a receptacle for the fetal urine ; in man its cavity is exceedingly minute, and its chief function is to furnish a means of conveying blood-vessels from the embryo to the chorion.
Text Appearing After Image:
Fig. 48.—Mesial section through an early human ovum (Graf Spee): a, Abdom- inal stalk; b, amnion; c, yolk-sac ; d, hypoblast; e, mesoblast; /, vessels on wall of yolk-sac; g, primitive streak; h, allantois; i, medullary plate; j, early heart; k, mesoblast of chorion ; I, early villi; m, chorionic mesoblast extending outward into villi. The part of the allantois contained within the body of the embryo produces three structures of the adult organism : 1, the urachus, an atrophic cord extending from the summit of the bladder to the umbilicus;1 2, the urinary bladder; and 3, the first part of the urethra of the male, or the entire female urethra. The extra-embryonic portion shrinks after the appearance of the placenta and forms one of the constituents of the umbilical cord, its blood-vessels becoming the umbil- ical arteries and veins. 1 If the urachus remains patulous instead of becoming impervious, urine may escape at the umbilicus, and the condition is a variety of urinary fistula.

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