. Gynecological pathology; a manual of microscopic technique and diagnosis in gynecological practice, for students and physicians. al intestine, the sexual prominence, the anal groove, and dividesthe primary perineum into a right and left perineal half, which passanteriorly into the sexual folds. These halves (mesodermal) pass poste-riorly into the anal region as anal prominences. The space (imaginary)covered by the cloacal plate has been called ectodermal cloaca, Assaid before, the opening for the sinus occurs first, and later, in theninth week, that for the anus. The perineum is formed by th
. Gynecological pathology; a manual of microscopic technique and diagnosis in gynecological practice, for students and physicians. al intestine, the sexual prominence, the anal groove, and dividesthe primary perineum into a right and left perineal half, which passanteriorly into the sexual folds. These halves (mesodermal) pass poste-riorly into the anal region as anal prominences. The space (imaginary)covered by the cloacal plate has been called ectodermal cloaca, Assaid before, the opening for the sinus occurs first, and later, in theninth week, that for the anus. The perineum is formed by the union ofthe perineal folds in the middle line forming the perineal raphe. Thesexual folds form the labia minora, the sexual or genital prominence 176 ANUS. forms the clitoris. The anus develops entirely in the region op theectoderm. The anal prominences, mesodermal, unite above the primitiveperineum and surround in this manner the above-mentioned ectodermalanal groove. After the formation of the permanent perineum, the ectodermal Mesoderm - Excavatio recto-uterine! .Genital orsexual strand- Excavatioutero-vesicalis Bladder. UreterIntestineWolffian ductMuellers duct £.._ Ureter Figure 91.—Pelvic End at the Level of the Bladder, with the Genital ok SexualStrand of the Left and Right Sides. Human Embryo of 9 Weeks. (Kollmann.) cloaca has been divided into the ectodermal sinus urogenitalis and intothe ectodermal intestine (anus). The former becomes that part of thevestibule of the vagina which is surrounded by the previously mentionedsexual folds (labia minora). These changes may be observed by a com-parison of Figs. 88 and 90. Into the celom there project from the dorsal wall of the body three Excav. recto-uter. Genital strand,later Lig. ut. lat Urinary Madder.
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