. The chordates. Chordata. Oviduct ~ Uterus Vagina Fig. 490. Four types of uteri. (A) Duplex: in rodents. (B) Bipartite: in certain carnivores. (C) Bicornate: in most insectivores and prosimians. (D) Simplex: characteristic of primates. (After Wiedersheim. Courtesy, Patten: "Embryology of the Pig," Philadelphia, The Blakiston Company.) carnivores; ruminant ungulates, pigs, horses). Complete union of right and left uterine chambers to form a single wide and undivided uterine space produces the uterus simplex (in monkeys, apes, and man). In marsupials the egg is fertilized and transpor
. The chordates. Chordata. Oviduct ~ Uterus Vagina Fig. 490. Four types of uteri. (A) Duplex: in rodents. (B) Bipartite: in certain carnivores. (C) Bicornate: in most insectivores and prosimians. (D) Simplex: characteristic of primates. (After Wiedersheim. Courtesy, Patten: "Embryology of the Pig," Philadelphia, The Blakiston Company.) carnivores; ruminant ungulates, pigs, horses). Complete union of right and left uterine chambers to form a single wide and undivided uterine space produces the uterus simplex (in monkeys, apes, and man). In marsupials the egg is fertilized and transported through a Fallopian tube into a uterine region of the oviduct, but no placenta or, at most, a very transitory and weakly developed placenta is formed. The period of gestation is short and the fetus is born while still quite small. The uterus is therefore much less strongly developed than in placental mammals. As to the vaginal regions of the oviducts, there are various conditions. Each duct differentiates a vaginal region. In the opossum (Didelphys: Fig. 491), the two vaginas remain quite separate, although their anterior regions bend sharply toward the median plane and lie close together, while posteriorly they open independently into the urinogenital sinus. In other cases (, kangaroo, phalanger, wombat: Fig. 491) the anterior regions of the right and left vaginal tubes become joined to form a median chamber into which the I wo uteri open, and from this median chamber a pouch (vaginal cecum) projects backward between the separate posterior right and left vaginal tubes. A median longitudinal septum more or less completely. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston
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