MALE PERINEUM 



169 



Nervus Perinei. The perineal nerve is one of the terminal 

 branches of the pudendal nerve. It arises in the posterior 

 part of the canal in the obturator fascia on the lateral wall 

 of the ischio-rectal fossa, and runs forwards, in the canal, 

 below the internal pudendal artery. At a varying point from 

 its commencement it divides into superficial and deep 

 branches. The superficial branches are the scrotal nerves. 

 They pierce the wall of the fascial canal and enter the 



Corpus cavernosum penis 

 Corpus cavernosum urethrae 





. Urogenital 

 diaphragm 

 M. transversus 

 perinei 

 __ Ischial 

 tuberosity 



FIG. 80. The Root of the Penis and the F'ascia inferior of the Urogenital 

 Diaphragm (O. T. triangular ligament) (Formalin specimen). 



anterior part of the ischio-rectal fossa, then they pierce the 

 base of the fascia of Colles and enter the superficial pouch 

 of the urogenital triangle, there they cross superficial to 

 the superficial transverse muscle of the perineum, and are 

 distributed to the skin of the anterior part of the perineum 

 and to the skin of the scrotum. 



The deep branch supplies twigs to the anterior part of 

 the levator ani and the external sphincter ani, then pierces 

 the base of the inferior fascia of the urogenital diaphragm, 

 and enters the superficial pouch, where it supplies the super- 



