PUDENDAL NEKVE. 



739 



in company with the inferior haemorrhoidal vessels, and separates into numerous 

 branches muscular, cutaneous, and communicating. 



The muscular branches end in the external sphincter ani muscle. The cutaneous 

 branches supply the skin around the anus. The communicating branches connect 

 the inferior hsemorrhoidal with three other nerves the perineal branches of the 

 posterior cutaneous nerve of the thigh, pudendal, and fourth sacral nerves. 



Nervus Perinei. The perineal nerve, one of the two terminal branches of 

 the pudendal nerve, arises near the base of the urogenital diaphragm. It almost 

 immediately divides into two parts, superficial and deep. 



The superficial part is purely cutaneous and consists of two nerves, the posterior 



sterior scrotalj 

 nerves \ 



Perineal branch of 

 sterior cutaneous 



nerve of thigh " 

 iperficial branch of 

 perineal nerve 

 Deep branch of" 

 perineal nerve"" 

 Nervus perinei -- 



haemorrhoidal 

 branches 



Dorsal nerve of penis 

 (displaced) 

 Nerve to corpus 

 cavernosum penis 



Nerve to corpus 

 cavernosum urethra} 



ir Superficial) 



branches 

 of perineal 

 ne: 

 Perineal nerve 



- Pudendal nerve 



Inferior hsemorrhoidal 

 branches 



--Pudendal nerve 



FIG. 632. DISTRIBUTION OF THE PUDENDAL NERVE. 



lateral and the anterior or medial superficial perineal nerves (nn. scrotales 

 posteriores or nn. labiales posteriores), which pass, along with the superficial perineal 

 vessels, to the anterior part of the perineum. The posterior or lateral superficial 

 perineal nerve, at the anterior limit of the ischio-rectal fossa, usually passes over the 

 base of the urogenital diaphragm and over the (superficial) trans versus perinei 

 muscle. The anterior or medial superficial perineal nerve, lying more deeply, pierces 

 the base of the fascia inferior of the urogenital diaphragm and goes underneath 

 or through the transversus perinei muscle. Becoming superficial in the anterior 

 (urethral) triangle of the perineum, they are distributed to the skin of the scrotum 

 (or labium majus), and communicate with the perineal rami of the posterior 

 cutaneous nerve of the thigh and with the inferior haemorrhoidal nerve. 



The deep part of the perineal nerve is mainly but not entirely muscular 



48 a 



