362 ABDOMEN 



arch to a point about half an inch below the symphysis, 

 where it pierces the superficial layer of the urogenital 

 diaphragm, and immediately ends by, under cover of the 

 crus penis, dividing into two branches viz. (i) the artery 

 to the corpus cavernosum penis, and (2) the dorsal artery 

 of the penis (Fig. 134, p. 357). 



Branches of the Internal Pudendal Artery. The pudendal 

 artery has already been seen to give off the inferior hcemorrhoidal, 

 and the perineal arteries, and to divide into its two terminal 

 branches the dorsal artery of the penis and the artery to the 

 corpus cavernosum penis. Between the layers of the urogenital 

 diaphragm it gives origin to the artery to the bulb. 



The artery to the bulb is a short, wide vessel which springs 

 from the pudendal about a quarter of an inch above the 

 level of the base of the urogenital diaphragm. It passes 

 medially, between the two fasciae of this diaphragm, and, giving 

 a small twig to the bulbo-urethral gland, it enters the sub- 

 stance of the bulb. It supplies the bulb and corpus 

 cavernosum urethrae with blood (Fig. 136). 



The artery to the corpus cavernosum penis pierces the medial 

 aspect of the crus penis, and is carried forward in the substance 

 of the corpus cavernosum penis, which it supplies with blood 



(Fig- 136). 



The dorsal artery of the penis runs forward in the interval 

 between the crura penis, and, passing between the two layers 

 of the suspensory ligament of the penis, gains the dorsum of 

 the penis, where it will be afterwards traced (Fig. 222). 



N. Pudendus (O.T. Pudic Nerve). The pudendal nerve is 

 a branch of the sacral plexus. Following the internal 

 pudendal artery it enters Alcock's canal, and, after giving off 

 the inferior hcemorrhoidal nerve, it divides into two terminal 

 divisions viz. (i) the perineal nerve, and (2) the dorsal nerve 

 of the penis. 



The perineal nerve has been seen to break up into the 

 following branches : 



Cutaneous. Posterior Scrotal. 



1. The nerve to the bulbo-cavernosus. 



2. The nerve to the ischio-cavernosus. 

 Muscular. - 3. The transversus perinei superficialis. 



4. The transversus perinei profundus. 



5. The nerve to the sphincter urethrae membranacere. 



It supplies also one or two branches to the bulb and the 

 corpus cavernosum urethrae. 



