Identifier: anatomydescripti1877gray (find matches)
Title: Anatomy, descriptive and surgical
Year: 1877 (1870s)
Authors: Gray, Henry, 1825-1861 Holmes, Timothy, 1825-1907
Subjects: Anatomy Human anatomy
Publisher: (London : Longmans, Green)
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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time as the genitalfurrow closes, viz., between the third and fourth month. * llr. Osborn, in tlie St Thomass Hospital Eeports, 1875, ^^s written an interestingpaper pointing out the probable connection between this fcetal structure and one form ofhydrocele. t Joiim. de Fhys., 1861. DEVELOPMENT OF GENITAL ORGANS. cxlis Fig. LXXXVII.—Development of the External genital organs. Indifferent type, I. II. III.Fenude.. A B, at the middle of the fifth month. 0, at the beginning of tlie sLxth.Male. A, at the beginning of the foiiith month. 15, at the middle of the ibiirthmonth. 0, at the end of the fourth month, i, cloaca. 2, genital tubercle. 3, glauspenis or olitoridis. 4, genital furrow. 5, e.^ternal genital folds (labia majora or scrotum).6, umbilical cord. 7, anus. 8, caudal extremity and coccygeal tubercle. 9, Labiaminora 10, urogenital sinus. ii,rr»uuni clitoridis. 12, Preputium penis or clitoridis.13, opening of the urethra. 14, opening of the vagina. 15, hymen. 16, scrotal raphe.
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The following table is translated from the work of Beaunis and Bou-chard, with some very unimportant alterations.* It will serve to present aresume of the above facts in an easily accessible form. * It will be noticed that the time assigned in this table for the appearance of the firstrudiment of some of the bones (e.g. the ilium), varies in some cases from that assigned onp. Ixii. This is a point on which anatomists differ, and which probably varies in different CHEONOLOGICAL TABLE OF THE DEVELOPMENT OE THE ECETUS. (FrOMBeAUNIS AMD BOUCHAUD.) JSml of second week.—Folmatiou of the amnion and umbilical vehicle. Chorda dorsalis andmedullary gTOOve. Heart. Beginning of third week.—The vitelline membrane has entirely disappeared. Protovertebraldiscs. First pharyngeal arch. Buccal depression. Primitive circulation. Und of third jueeA;.—The allantois and Wolffian body appear. The amnion is closed.Cerebral vesicles. Primitive ocular and auditor) ve.sicles. Coalescence of the inferiorma

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