Human physiology (Volume 2) . dmitted to be a physiological condition. Osiander andDollinger class it amongst imaginary organs; and Velpeau remarks,that out of about two hundred vesicles, which he had examined,in foetuses under three months of development, he had met withonly thirty in which the umbilical vesicle was in a state, thatcould be called natural. Under such is not easyto understand how he could distinguish the physiological fromthe pathological condition. If the existence of the vesicle be apart of the physiological or natural process, the majority of vesi-cles ough
Human physiology (Volume 2) . dmitted to be a physiological condition. Osiander andDollinger class it amongst imaginary organs; and Velpeau remarks,that out of about two hundred vesicles, which he had examined,in foetuses under three months of development, he had met withonly thirty in which the umbilical vesicle was in a state, thatcould be called natural. Under such is not easyto understand how he could distinguish the physiological fromthe pathological condition. If the existence of the vesicle be apart of the physiological or natural process, the majority of vesi-cles ought to be healthy or natural; yet he pronounces the thirtyin the two hundred to be alone properly formed; and, of conse-quence, one hundred and seventy to be morbid or unnatural. Thisvesicle is described as a small pyriform, round or spheroidalsac; which, about the fifteenth or twentieth day after fecunda-tion, is of the size of a common pea. It probably acquires itsgreatest dimensions in the course of the third or fourth Diagram of the Fmtus and Membranes about the sixth Chorion b. The larger absorbent extremities, the site of the placenta, e. Allantois. d. Am-nion, e. Urachus. Bladder. /. Vesicula umbilicalis. g. Communicating canal between thevesicula umbilicalis and intestine, h. Vena umbilicalis. ii. Arteriieumbilicales. I. Vena omphalo-meseraica. It. Arteria omphalo-meseraica. n. Heart, o. Rudiment of superior extremity, p. Rudi-ment of lower extremity.—(Carus.) After a month, Velpeau always found it smaller. About the fifthsixth or seventh week it is about the size of a coriander seed. • Annotat. Academic, lib. i. p. 74. t> Graphic Illustrations of Abortion, p. xii. Lond. 1834. c Meckels Archiv. iv. s. 34 ; and Journ. Complement du Diet, des Sciences Medi-cales, ii. 1818, p. 84. d Opera, p. 304, Ultraject, 1672; see, also, Mackenzie, in the Edinburgh Medicaland Surgical Journal for January, 1836, p. 46. For a list of those who have describedit, se
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