CH. LIX.] 



SUPRARENAL CAPSULES 



877 



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, whilst in front of it there is formed 

 a penis-like body surmounted by the glans, with a cleft or furrow 

 along its under surface. The borders of the furrows diverge pos- 

 teriorly, running at the sides of the genito-urinary orifice internal to 

 the cutaneous folds just mentioned. In the female, this body becom- 



FIG. 677. -Diagram of the Wolffian bodies, Miilleriau 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 ; mm, Miillerian ducts; g c, genital 

 cord : ug, sinus uro-genitalis ; i, intestine ; cl, cloaca. (Allen Thomson.) 



ing retracted, forms the clitoris, and the margins of the furrow on 

 its under surface are converted into the nymphae, or labiae minora, 

 the labia majora pudendse being constituted by the great cutaneous 

 folds. In the male foetus, the margins of the furrow at the under 

 surface of the penis unite at about the fourteenth week, and form 

 that part of the urethra which is included in the penis. The large 

 cutaneous folds form the scrotum, and later receive the testicles. 

 Sometimes the urethra is not closed, and the deformity called hypo- 

 spadias then results. The appearance of hermaphroditism may, in 

 these cases, be increased by the retention of the testes within the 

 abdomen. 



The supra-renal capsules originate partly from the mesoblast and 



