File:Image from page 97 of "Practical anatomy of the rabbit - an elementary laboratory textbook in mammalian anatomy" (1921) (16663073051).jpg

Title: Practical anatomy of the rabbit : an elementary laboratory textbook in mammalian anatomy Identifier: 3edpracticalanat00bensuoft Year: 1921 (1920s) Authors: Bensley, B. A. (Benjamin Arthur), 1875-1934 Subjects: Mammals -- Anatomy; Rabbits Publisher: Toronto : University of Toronto Press Contributing Library: Gerstein - University of Toronto Digitizing Sponsor: MSN

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Text Appearing Before Image: 92 Anatomy of the Rabbit. with the lymphatic trunks form extensive plexuses, in connection with which the lymph nodes are distributed. THE URINOGENITAL SYSTEM. The urinogenital system comprises two primary systems— reproductive and urinary—differing widely in their central organs, but associated to a certain extent by having common ducts. In the rabbit, as indicated in the accompanying diagram (Fig. 46), this association extends only to the presence in the two sexes of a urinogenital canal, or urinogenital sinus connecting both urinary and genital structures with the outside of the body. This canal is designated in the male as the urethra, but in the female as the

Text Appearing After Image: Fig. 49. The principal stages in specialization of the female urinogenital ducts in vertebrates. A, frog; B, monotreme; C marsupial, bl, bladder; cl, cloaca; k, kidney; od, oviduct; ov, ovary; r, rectum* u, ureter; us, urinogen- ital sinus (vestibulum); ut, uterine tube; v, vagina. Chiefly from figures of Gegenbaur and Wiedersheim. vestibulum, since the structure known from the human relation as the female urethra is only a urinary canal leading from the bladder, and in man is not associated with the reproductive ducts. In primitive vertebrates (Fig. 49), the urinary and genital ducts open into the posterior end of the digestive tube, the latter forming in this relation a common canal, the cloaca. In terrestrial vertebrates, the urinary bladder is developed as a ventral outgrowth of the digestive tube, and, except in amphibians, both sets of ducts undergo a migration from their original position on to the wall of its canal, the latter being thus trasfnormed into a URINOGENITAL DUCTS IN VERTEBRATES.

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