A CONTPJBUTION TO THE MORPHOLOGY OF THE 

 HUMAN" URINOGENITAL TRACT. By D. Berry 

 Hart, M.D., E.R.C.P. Edin., etc., Lecturer on Midwifery 

 and Diseases of Women, School of the Royal Colleges, Edin- 

 burgh, etc. (Plates XXXV., XXXVI.) 



In two previous communications I discussed the questions of 

 the origin of the hymen and vagina. I there attempted to 

 show that the lower ends of the Wolffian ducts enter into the 

 formation of the former, and that the latter was Miillerian in 

 origin only in its upper two-thirds, the lower third being formed 

 by blended urinogenital sinus and Wolffian ducts. In following 

 this line of inquiry more deeply it resolved itself into a much 

 wider question — -viz., the morphology of the human urinogenital 

 tract, and this has occupied much of my spare time for the last 

 five years. It soon became evident that what one required to 

 investigate was really the early history and ultimate fate of the 

 Wolffian body and its duct, as well as that of the Miillerian 

 duct, and this led one back to the fundamental facts of de- 

 velopment in relation to bladder and bowel. The result of this 

 investigation will therefore be considered under the following 

 heads : — 



I. The Development of the Urinogenital Organs, 

 Rectum and External Genitals in the Human 

 FcETUS UP to the end of the first Month. The 

 Development of the Permanent Kidney is not 

 considered. 

 II. The Condition of these Organs at the 6th to 7th 

 Week. 



III. The Changes at the 14th Week and at the 24th. 



IV. The Structure and Origin of the Adult Human 



Vagina. 

 V, The Genital Tract in the Marsupialia. 

 VI. The Analogues of the Human jMale and Female 

 Genital Tract. 



