. Bensley's Practical anatomy of the rabbit : an elementary laboratory text-book in mammalian anatomy. Rabbits -- Anatomy. THE GENITAL ORGAXS 129 of every vertebrate, the testis is formed in association with the dorsal abdominal wall, but in many m T. mammals it moves backward either periodically or perma- nently in the course of de- velopment, to a position in a separate sac derived from the posteroventral part of the coelom, the scrotal sac. This change in position, known as the descent of the testis, has been shown to be an adap- tation for temperature regu- lation in that organ. It i
. Bensley's Practical anatomy of the rabbit : an elementary laboratory text-book in mammalian anatomy. Rabbits -- Anatomy. THE GENITAL ORGAXS 129 of every vertebrate, the testis is formed in association with the dorsal abdominal wall, but in many m T. mammals it moves backward either periodically or perma- nently in the course of de- velopment, to a position in a separate sac derived from the posteroventral part of the coelom, the scrotal sac. This change in position, known as the descent of the testis, has been shown to be an adap- tation for temperature regu- lation in that organ. It is controlled by a cord of muscle and connective tissue, the gubernaculum, which is re- tained in the adult rabbit as a fibrous band attaching the testis to the end of the scrotal sac. The migration of the Fig. 77. The female urinogenital system: a, aorta; as, internal spermatic artery; au, umbilical artery; c, clitoris; gp, inguinal gland; gr rectal gland; h hydatid of uterine tube; hr orS:an determines a UUmbcr middle hasmorrnoidal artery; i, inferior caval ° vein; lo. ovarian ligament; It, round ligament; lu. umbilical ligament; ms, mesosalpinx; mt, mesometrium; o, ovary; ot, ostium tubae; r, of itS blood-VCSScls and pcri- rcctum; rp, peritoneal recess (rudimentary vaginal process); tu, uterine tube; u, ureter; tOUCal COUnCCtlOnS. uterus; vg, vagina; vs, vestibulum; vu, urinary bladder. of peculiarities in the relations The Ovary and Oviducts The female gonad or ovary (Fig. 77) lies on the dorsal wall of the abdominal cavity, thus retaining to a large extent the primitive position. It has, however, gubernacular connections corresponding with those of the testis and these are plainly discernible in the adult animal as the ovarian and round ligaments, of which the latter is inserted into a small pocket of the abdominal wall simulating the testis sac. Though inconspicuous in gross size as compared with the testis, the ovary is concerned wdth the formation of cells of relat
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