INTERNAL PUDIC ARTERY. 251 



enae comites and the dorsal nerve of the penis. Its offsets in this Branches : 

 oart of its course are : 



a. Deep muscular branches (d). As the artery is about to enter Muscular. 

 Between the layers of the triangular ligament it furnishes one or 

 more branches to the levator aid and sphincter, arid fine twigs through 

 he ligament to the constrictor and the urethra. 



6. The artery of the bulb is a branch of considerable size, which Artery of 

 arises near the base of the triangular ligament. It passes almost j^ian-^uUir 6 

 ransversely inwards between the fibres of the constrictor muscle, ligament: 

 ibout half an inch from the base of the triangular ligament, and 

 caches the upper surface of the bulb to enter the spongy struc- 

 ure. Near the urethra it furnishes a small branch to Cowper's 

 gland. 



The distance of this branch from the base of the ligament will its situation 



influenced by its origin being nearer the front or back of the vanes - 

 perineal space. If it arises earlier than usual it may be altogether 

 ehind the ligament and cross the front of the ischio-rectal fossa, 

 so as to be liable to be cut in the operation of lithotomy. 



c. The artery of the corpus cavemosum (c) is one of the terminal Artery of 

 jranches of the internal puclic. At first this vessel lies between !^ 



pciiiis, 



he cms penis and the bone, but it soon enters the crus, and ramifies 

 11 the cavernous structure of the penis. 



d. The dorsal artery of the penis (h] is in direction the continuation Artery of 

 >f the internal pudic ; it runs upwards between the crus and the 



bone, and reaches the dorsum of the penis by passing through its 

 uspensory ligament. Its distribution with the accompanying nerve 

 will be noticed directly. 



Accessory pudic artery. In some cases the pudic artery is not large Accessory 

 enough to supply the branches above described to the penis and the urethra, pudic 

 One or more oftsets will then be contributed by an accessory vessel, which artei '. x ' : 

 leaves the pelvis in front by piercing the triangular ligament. The source of source, 

 this accessory artery is the internal iliac (p. 399). 



The pudic reins, two in number, have frequent communications Pudic 

 together, so as to form a plexus round the artery ; they receive veins ' 

 similar branches, except that the dorsal vein of the penis does not 

 join them. 



The DORSAL SERVE OF THE PENIS has been seen in the ischio- Dorsal nerve 



rectal fossa (p. 243). In the anterior half of the perineum it takes a of 

 similar course to the pudic artery, but at a deeper level and in a 

 distinct sheath within the triangular ligament, and then pierces the 

 superficial layer of that structure close to the inferior ramus of the 

 pubis, to be continued with the dorsal artery to the penis. On its 

 way the nerve supplies filaments to the constrictor urethras muscle. 



Dissection. The ejaculator urinae muscle will now be carefully 

 cleared away from the subjacent bulbous and spongy part of the 

 urethra, and the erector penis muscles will be similarly removed to 

 fully expose the crura. 



The CRURA OF THE PENIS are attached on each side to the conjoined cmra of 

 raiui of the pubis and ischium for about an inch, and it will be seen lienis> 



