ARTERIES 87 



at upper border of obturator externus. In pelvis it is placed 

 between pelvic fascia and peritoneum, and just below obtu- 

 rator nerve. It lies beneath the horizontal pubic ramus with 

 companion vein and nerve in canal, formed above by bone 

 and below by obturator membrane. 



Branches within pelvis : 



Iliac : enters iliac fossa, supplies iliacus and bone ; anas. 

 ilio-lumbar. 



Pubic : ascends posterior surface of pubis ; anas, opposite 

 fellow, deep epigastric. 



Branches outside pelvis : 



Internal terminal : curves inwards beneath obturator ex- 

 ternus, supplies obturators, gracilis, and adductors; anas. 

 internal circumflex, and external branch of obturator. 



External terminal : passes downwards and outwards beneath 

 obturator externus to ischial tuberosity, supplies obturators, 

 hamstrings and hip-joint ; anas, sciatic and internal branch 

 of obturator. 



Internal Pudic : 



In the male. Proceeds out of pelvis by great sacro-sciatic 

 notch below pyriformis, winds round ischial spine, re-enters 

 pelvis by small notch, passes within the obturator fascia on 

 inner side of tuber ischii, courses along pubic arch, perforates 

 the two layers of triangular ligament very obliquely, dividing 

 on triangular ligament into dorsal of penis and artery of 

 corpus cavernosum. 



Relations. In the pelvis, lies to outer side of rectum, in 

 front of pyriformis and sacral plexus. In gluteal region is 

 seen under gluteus maximus, on ischial spine, below pyri- 

 formis, external to pudic nerve, and internal to nerve to 

 obturator internus. Thence, in company with vein and nerve, 

 it is on external wall of ischio-rectal fossa, and internal to 

 obturator internus. Beneath triangular ligament crossed by 

 transverse perineal muscle. 



Branches : 



Inferior hamorrhoidal : arises just inside tuber ischii, piercing 

 Alcock's canal, crosses transversely ischio-rectal fossa, sup- 

 plies sphincter and levator ani ; anas, middle hsemorrh'oidal 

 and opposite fellow. 



Superficial perineal : arising half-way in ischio-rectal fossa, 

 runs parallel to pubic arch, crossing transversus perinei, lying 

 deep to Colics' fascia, between erector penis and accelerator 

 urinae, supplying them, together with scrotum ; anas, super- 

 ficial pudic of femoral. 



Transverse pciincal : arises from superficial perineal or from 



