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: 96 Anatomy of the Rabbit. with the coelomic cavity (Fig. 51 B). Their ciliated internal openings, termed nephrostomes, are not developed in specialized kidneys, but may be seen, even in the adult condition, in some lampreys, where they communicate with that portion of the body cavity enclosing the heart. In the rabbit, as in all mammals, the male gonad or testis (Fig. 55), ^ in which the male germ cells, spermatozoa, are matured, is connected with the peri- pheral duct system (Fig. 52) by means of the epididymis and the ductus deferens, parts of the mesonephric connections of the embryo. While the ductus deferens is a single tube, the epididymis THE consists of an ag- TESTIS gregation of small AND tubules, lying chiefly toward the anterior end of the testis, but with the tubules not individually discernible. The testis is formed in the embryo in all vertebrates in associa- tion with the dorsal abdo- minal wall, but in many mammals moves backward to a scrotal position, either periodically or permanently in the course of development. This change, known as the descent of the testis, is brought about through the agency of a muscular cord, the gubernaculum, the connections of which in the rabbit, are retained in the adult condi- tion. The migration of the organ determines a number of peculiar- ities in the relations of its bloodvessels and peritoneal connections. The female gonad or ovary (Fig. 53) lies on the dorsal wall of the abdominal cavity, thus retaining to a large extent the primitive

Text Appearing After Image: ITS DUCT. Fig. 53. The female urinogenital system: a, aorta: as, internal spermatic artery; au, umbilical artery; c, clitoris; gp, perineal gland; gr, rectal gland; h, hydatid of uterine tube; hr, middle hemorrhoidal artery; i, inferior caval vein; lo, ovarian ligament; It, round ligament; lu, umbilical ligament; ms, mesosalpinx; mt, mesometrium; o, ovary; ot, ostium tuba?; r, rectum; rp, peritoneal recess (rudimentary vaginal process); cu, uterine tube; u, ureter; ut, uterus; vg, vagina; vs, vesti- bulum; vu, urinary bladder.

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