NERVES. 



clitoris), communicating with branches of the ilio-inguinal 

 and pudic. [655] 



Pudic. Arising usually from the second, third, and fourth 

 sacral, this runs through the great sacro-sciatic foramen below 

 the great sciatic nerve; then crossing the ischial spine (or 

 lesser sacro-sciatic ligament) it runs through the small sacro- 

 sciatic foramen with the pudic artery, and then along the outer 

 wall of the ischio-rectal fossa in a sheath of parietal pelvic 

 fascia, and divides at the base of the triangular ligament into 

 the perineal nerve and the dorsal nerve of the penis. The in- 

 ferior hemorrhoidal nerve, its other branch, arises usually at the 

 back of the ischio-rectal fossa, but may arise separately from 

 the plexus (third and fourth sacral) and accompany the pudic. 

 It crosses the ischio-rectal fossa with the inferior hemorrhoidal 

 vessels and divides into muscular branches, to the External 

 sphincter; cutaneous, to the anus; and communicating, to the 

 small sciatic, pudic, and fourth sacral. [658] 



The perineal nerve divides at once into two parts, superficial 

 and deep. The superficial part consists of two nerves; one 

 (posterior, or external superficial perineal) runs over the Trans- 

 versus perinei and base of the triangular ligament, while the 

 other (anterior, or internal superficial perineal) runs through 

 them; both run forward to the skin of the scrotum (labium 

 majus) and communicate with the small sciatic and inferior 

 hemorrhoidal. The deep part runs forward between the layers 

 of the triangular ligament, then pierces the anterior layer and 

 the bulb of the urethra, to supply the erectile tissue and mu- 

 cous membrane of the bulb and corpus spongiosum. Muscular 

 branches supply the Levator ani, External sphincter, Trans- 

 versus perinei, Erector penis (clitoridis), Bulbo-cavernosus 

 (Sphincter vaginae), and Compressor urethra?. [659] 



The dorsal nerve of the penis runs forward, with the internal 

 pudic artery, under the superficial layer of the triangular liga- 

 ment, and along the pubic arch, under the crus and Erector 

 penis (vel clitoridis). Then piercing the triangular ligament it 



[203] 



