Text Appearing Before Image: The upper part of the urogenital sinus has contracted into the urethra; the lower portion, SU,now becomes the vulva. P, perineum. H, rectum. V, vagina. B, bladder. U, urethra. Figure 239.G Text Appearing After Image: FiorRE 239.—Absence of cloaeal division. Perineal septum wanting. R, rectum. G,genital canal. B. bladder. Figure 240.—Absence of cloaeal division. Perineal septum present. genital sinus. This sinus in its upper part becomes the urethra, andin its lower part the vulva. The anomalies of the vulva and anus are : Atresia. Persistent cloaca. Hypospadias. Epispadias. Infantile vulva.Atresia of the Urethra, Vagina, and Anus.—The cloaeal divi-sion by which the urethra, vasrina, and anus are opened and therebyprolonged to the external surface may fail to take place. This failure 508 TUMORS, TUBAL PREGNANCY, MALFORMATIONS. will result in complete atresia of the vagina, urethra, and anus. Theperineal septum may be absent, as shown in Figure 239, or present,as shown in Figure 240. In the latter case the opening between therectum and the urogenital sinus will be closed. This condition ofcomplete atresia has been observed only in stillborn foetal monstrosi-ties. The bladder, urethra, and vagi
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