822 HANDBOOK OF PHYSIOLOGY. 



or abnormal development, these portions of the Miilleriau ducts may not 

 become fused together at their lower extremities, and there is left a 

 cleft or horned condition of the upper part of the uterus resembling a 

 condition which is permanent in certain of the lower animals. 



In the male, the Miillerian ducts have no special function, and are 

 but slightly developed. The hydatid of Morgagni is the remnant of the 

 upper part of the Miillerian duct. The small prostatic pouch, uterus 

 masculinus, or sinus pocularis, forms the atrophied remnant of the dis- 



Fig. 516. Diagram of the Wolffian bodies, Miillerian ducts and adjacent parts previous to 

 sexual distinction, as seen from before, sr, the supra-renal bodies ; r, the kidneys ; ot, common 

 blastema of ovaries or testicles ; W, Wolffian bodies ; w, Wolffian ducts ; m m, Miillerian ducts ; 

 g c, genital cord; ug, sinus urogenitalis ; i, intestine; d, cloaca. (Allen Thomson.) 



tal end of the genital cord, and is, of course, therefore, the homologue, 

 in the male, of the vagina and uterus in the female. 



The external parts of generation are at first the same in both sexes. 



The opening of the genito-urinary apparatus is, in both sexes, bounded 

 by two folds of skin, while in front of it there is formed a penis-like 

 body surmounted by a glans, and cleft or furrowed along its under sur- 

 face. The borders of the furrows diverge posteriorly, running at the 

 sides of the genito-urinary orifice internally to the cutaneous folds just 

 mentioned. In the female, this body becoming retracted, forms the 

 clitoris, and the margins of the furrow on its under surface are converted 

 into the nymphae or labia minora, the labia majora pudendae being con- 

 stituted by the great cutaneous folds. In the male foetus, the margins 



