File:Image from page 648 of "A manual of zoology" (1902) (20732526015).jpg

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Title: A manual of zoology Identifier: cu31924001021835 Year: 1902 (1900s) Authors: Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929 Subjects: Zoology Publisher: New York, H. Holt and Company Contributing Library: Cornell University Library Digitizing Sponsor: MSN


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Text Appearing Before Image: IV. VERTEBRATA: MAMMALIA. 629 Miillerian ducts into the urogenital sinus {ug), tlie lower continua- tion of the bladder. The gonad is connected with the Wolffian duct. In the anterior wall of the urogenital sinus is a mass of highly vascular tissue (cp), from which and a surrounding fold the external genitalia are developed. Since the urogenital sinus opens from in front into the intestine, there is always a claoca {d) in the embryonic stages, whicli persists throughout life in the mono- tremes, and to a considerable extent in the female marsupials: in all other vertebrates it is divided by a partition, the perinanim, into a urogenital opening in front and an anal opening behind. From this indifEerent condition the male and female apparatus are derived, the structures being closely similar in most males (fig. G52). The Miillerian duct vanishes, while the "Wolffian duct be- comes the vas deferens and its accessories, serving as a canal for the genital products, while the external genitals arise from the other parts mentioned, these forming an intromittent organ (penis). In the female the Wolffian body and duct degenerate, the Miillerian ducts become the reproductive canals. The modi- fications of these become of great systematic importance. In the monotremes both diicts open separately and become differentiated into two parts (fig. G53, A), aiiterior oviducts with wide openings

Text Appearing After Image: Fig. 653.—Female genitalia of (A) Echidna aculeata; (B) of Didelphys dorsigera; (C) Phascolomys wombat. (B and C, after Wiedersheim.) cl, cloaca; d, rectum; h, urinary bladder; n, kidney; o, ovary; od, oviduct; pu, month of ureters; su, urogenital sinus; t, ostium abdominale tube; u, uterus; u', opening into vagina; ur, ureter; v, vagina; vb, vaginal blind sac

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