EXTERNAL ILIAC. 145 



from the pelvis, from which it escapes and returns between the 

 sciatic ligaments ; ascending upon the ramus of the ischium it sup- 

 plies the penis and perineum. 



Fig. 126. 



Lower hamorrJioidal}^ — Arises from the internal pudic, and is 

 distributed upon the anus and rectum. There are sometimes two 

 arteries. 



Transverse perineal}^ ". — Arises near the crus of the penis, and 

 runs across the transverse perineal muscles. It is cut in the lateral 

 operation for lithotomy. 



JJrethrO'Vulvar}'^ — Is given off from the pudic near its perfora- 

 tion of the triangular ligament, and enters the corpus spongiosum. 



Dorsal. — Ascends until it gets under the arch of the pubis, and 

 then runs along the back of the penis. 



Caver?zous^* — Another terminal branch which enters the corpus 

 cavernosum. 



EXTERNAL ILIAC. 



This artery extends from the sacro-iliac junction along the inner 

 border of the psoas muscle to the crural arch ; when it passes under 

 Poupart's ligament it becomes fe^noral. 



Epigastric * — Arises from the external iliac just behind Poupart's 

 ligament, and ascends obliquely upwards and inwards, under the 

 transversalis fascia, and between the two abdominal rings, whereby 

 it is endangered in the operation for hernia. A branch of it supplies 

 the cremaster muscle. 



13 



