MALE PERINEUM 



353 



wards to its posterior extremity, it gradually tapers away, and 

 it is firmly fixed to the corresponding pubic arch, by an 

 attachment which extends from the apex of the arch back- 

 wards to within a short distance of the tuber ischiadicum ; 

 it is also attached to the adjacent part of the lower surface of 

 the inferior fascia of the urogenital diaphragm. The corpus 

 cavernosum urethrse is slender in comparison with the corpus 

 cavernosum penis, it is lodged in the groove on the inferior 



Corpus cavernosum penis 

 Corpus cavernosum urethrae 



Urogenital 

 diaphragm 

 Transversus 



tuberosity 



FIG. 132. The Root of the Penis and the Urogenital Diaphragm 

 (O.T. triangular ligament) (formalin specimen). 



surface of the latter, and it is traversed throughout its whole 

 length by the urethra. It is continued posteriorly, beyond the 

 point where the corpus cavernosum penis divides into the two 

 crura, to within a short distance of the anus, and as it passes 

 backwards it expands, forming the bulbus urethra which lies 

 between the diverging crura, and is attached by its superior 

 surface to the inferior surface of the lower fascia of the 

 urogenital diaphragm. The posterior extremity of the bulb 

 is frequently notched in the middle line an indication of 

 an original double constitution. 

 VOL. i 23 



