. Comparative anatomy. Anatomy, Comparative. Oviduc-t ~~ Uterus - Vagi na. Fig. 339.—Four types of uteri occurring in different groups of mammals. A, duplex, the type found in rodents; B, bipartite, the type found in certain carnivores; C, bicor- nate, the type found in most insectivores and prosimians; D. simplex, the type characteristic of the primates. (From Patten's "Embryology of the Pig," after Wiedersheim.) In female mammals a tendency of the Muellerian ducts—which parallel the Wolffian ducts and lie medial to them—to fuse in the median line is evident. Beginning with the mono
. Comparative anatomy. Anatomy, Comparative. Oviduc-t ~~ Uterus - Vagi na. Fig. 339.—Four types of uteri occurring in different groups of mammals. A, duplex, the type found in rodents; B, bipartite, the type found in certain carnivores; C, bicor- nate, the type found in most insectivores and prosimians; D. simplex, the type characteristic of the primates. (From Patten's "Embryology of the Pig," after Wiedersheim.) In female mammals a tendency of the Muellerian ducts—which parallel the Wolffian ducts and lie medial to them—to fuse in the median line is evident. Beginning with the monotremes the posterior part of the Muellerian ducts fuse into a single uterus, while their anterior portions remain separate as the paired uterine or Fallopian tubes. The monotreme uterus opens into the urogenital sinus. In the higher mammals a vagina for the reception of the penis is differentiated between the uterus and the urogenital sinus. The vagina is therefore seen to be a portion of the united Muellerian ducts. The duplex character of the vagina appears in the marsupials (didelphians) which have two vaginae. In placental mammals, however, the vagina is single. Four stages in the increasing. 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 Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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