. The Principles and practice of gynecology : for students and practitioners. re, ifnot unknown. Imperforation, so-called, is a condition usually due toclosure of the end of a Muellerian duct, and is therefore in no sense anabnormal hymen. The importance of these anomalous conditions varies. A rigidhymen makes coitus painful or impossible, a very vascular membranemay lead to a temporary profuse hemorrhage, and imperforation givesrise to hjematocolpos, or in extreme cases also to hsematometra, anddemands operative interference ; see Congenital Atresia of the GenitalTract. A rigid hymen may, aft
. The Principles and practice of gynecology : for students and practitioners. re, ifnot unknown. Imperforation, so-called, is a condition usually due toclosure of the end of a Muellerian duct, and is therefore in no sense anabnormal hymen. The importance of these anomalous conditions varies. A rigidhymen makes coitus painful or impossible, a very vascular membranemay lead to a temporary profuse hemorrhage, and imperforation givesrise to hjematocolpos, or in extreme cases also to hsematometra, anddemands operative interference ; see Congenital Atresia of the GenitalTract. A rigid hymen may, after marriage, recpiire divulsion orincision. MALFORMATIONS OF THE VULVA AND ANUS. This subject becomes relatively simple when we understand theembryological development of the vulva and anus. At the end ofthe sixth week of foetal life the tangible differentiation of sex begins,and the developmental changes Avhich then normally take place areshown in Figures 234 to 238. The student is referred to the em-bryology of the genitalia in the first part of this chapter. Figure
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