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Text Appearing Before Image: WJarble (bicara)Fallopian Tube ^^ Ostium Tubae Fimbriae of Tube Epoophoron Mesovarium Ovary Vagina Urethral Opening-^n Y\[\ PjX-- Labi urn Minus (Nympha) ^>n—Labium Major Fig. 401. Dorsal view diagram of human female reproductive organs. (After Toldt.) The vagina is that part of the oviduct adapted to receive the penis. It is absent in the monotremes where the cloaca serves the same purpose. In the opossum, Didelphys, and other marsupials, there are two distinct vaginas which barely coalesce into one at the outer entrance, while in some other marsupials there is a coalescence at the inner ends from which a median diver- ticulum, or third vagina, extends pos- teriorly as a blind alley between the two lateral vaginas (Fig. 402). Whenever a fetus becomes deposited in this closed middle vagina instead of in one of the two lateral open passage-ways, there must be a rupture at birth at the blind end of the middle vagina to allow for the expulsion of the young. In placental mammals the outer ends of the two oviducts open into a single vagina, located between the rectum dorsally and the urethra ventrally (Fig. 367). It is lined with mucous membrane, frequently crossed by transverse rugae, particularly in young individuals. The vaginal mucosa is without glands, the mucus that is present there coming from the walls of the uterus, especially the cervix, which is continuous with
Text Appearing After Image: Urogenital Sinus Rectal Gland Rectum Fig. 402. Female urogenital organs of the wombat, Phascolomys, a mar- supial. (After Wiedersheim.)
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