. Gynecological pathology; a manual of microscopic technique and diagnosis in gynecological practice, for students and physicians. hough at an earlier period thedistinction is evident through a difference in the character of the epithe-lial cells. The vagina develops from the lower end of the ducts of the same time the urogenital sinus becomes shorter. With the growth VAGINA. 179 of the vagina and the shortening of the sinus the formation of theurethra goes on. The longer the vagina and the shorter the sinus thenearer does the opening of the urethra approach the cloacal groove, unti
. Gynecological pathology; a manual of microscopic technique and diagnosis in gynecological practice, for students and physicians. hough at an earlier period thedistinction is evident through a difference in the character of the epithe-lial cells. The vagina develops from the lower end of the ducts of the same time the urogenital sinus becomes shorter. With the growth VAGINA. 179 of the vagina and the shortening of the sinus the formation of theurethra goes on. The longer the vagina and the shorter the sinus thenearer does the opening of the urethra approach the cloacal groove, untilit and the vagina assume their normal situation, the sinus forming thevestibule. The portion of the vestibule of the vagina immediately sur-rounding the urethral opening, and the external opening of the vagina,the upper surface of the hymen, and the region of the openings of theglands of Bartholini, belong to the entodermal urogenital sinus. The ecto-dermal urogenital sinus forms that part of the vestibule covered by thelabia minora. Post, brain 1 Branchialcleft Heart , Intestine Mesonephros or Wolffian body Celom Extremity. Middle brain ijX— Large brain Forehead Lung sacs Germinal fold—future ovary Abdom. wall Genital prominence Caudal end Figure 95.—Human Embryo in the Fifth Week, the Anterior Body Wall Removed,the Mesonephros Exposed. (Kollmann.) As soon as the ureters enter independently into the cloaca (12-13 mm.)the development of the bladder begins through the change of this anteriorportion of the cloaca into a spindle-shaped tube. The part not used forthe bladder forms the urachus. Through growth of the future trigonumthe entrance of the ureters is more and more separated from the Wolff-ian ducts. It must be mentioned that Minot and others consider theanterior part of the cloaca, which the Wolffian ducts and ureters enter,as belonging to the allantois and not to the cloaca. As cloaca and al-lantois are both derived from the same entodermal space such a distinc-ti
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