THE INTERNAL ILIAC ARTERY. 



397 



psoas muscle and the obturator nerve, but in front of the lumbo- 

 sacral cord, and divides into an ascending and a transverse branch : 



The ascending or lumbar Branch runs beneath the psoas ; it ascending 

 supplies that muscle and the quadratus lumborum, anastomoses 

 with the last lumbar artery, and sends a small spinal branch through 

 the foramen between the sacrum and the last lumbar vertebra. 



The transverse or iliac branch divides into offsets that ramify in a transverse 



branch. 



Gluteal artery. 

 Sciatic artery. 

 Internal pudic 

 artery. 



FIG. 148. THE INTERNAL ILIAC ARTERY (TIEDEMANN). 



A. Bladder. 



B. Lower end of the rectum, 

 c. Levator ani. 



D. Psoas magnus. 



E. Psoas parvus. 



F. Iliacus. 



G. Yas deferens. 



H. Yesicula seminalis. 



Arteries : 



a. Aorta splitting into the common 

 iliacs. 



b. Middle sacral. 



c. Common iliac. 



d. External iliac. 



e. Deep epigastric. 



/. Deep circumflex iliac. 

 g. Internal iliac, continued by an 

 impervious cord along the bladder. 

 h. Ilio-lumbar. 

 i. Lateral sacral. 

 Jc. Obturator. 

 I. Middle hsemorrhoidal. 



Nerves : 



1. Lumbo-sacral cord. 



2, 3, 4. Upper three sacral nerves. 

 5. Obturator. 



the iliacus muscle, some running over and some beneath it. At 

 the iliac crest these branches anastomose with the lumbar and deep 

 circumflex iliac arteries ; some deep twigs communicate with the 

 obturator artery, and enter the hip-bone. 



The ilio-lumbar rein opens into the common iliac trunk. 



The lateral sacral arteries (fig. 148, i) are usually two in number, 



Lateral 



arteries 



