144 



INTERNAL ILIAC. 



Fig. 125. 



INTERNAL ILIAC. 



This is a short trunk,^ descending from the sacro-ihac junction 

 into the cavity of the pelvis, and giving off numerous branches with 

 great irregularity and variety from its two principal trunks, the 

 gluteal* and ischiatic? 



Ilio-lumbar.^^ — Arises from the internal iliac or one of its principal 

 trunks, ascends outwardly toward the crest of the ilium, and is spent 

 upon the loins, &c. 



Obturator .^"^ — May arise at various parts of the internal iliac, and 

 passing forwards below the brim of the pelvis, escapes from it at the 

 upper part of the thyroid foramen ; it is distributed by two branches 

 upon the obturator and adductor muscles. 



Lateral sacral.'^^ — This artery sends four branches through the 

 anterior sacral foramina, or they may be several distinct arteries 

 with different origins. 



Gluteal.^^ — Is a continuation of the posterior trunk. It passes out 

 of the pelvis at the upper part of the sacro-sciatic notch above the 

 pyriformis muscle, and is distributed by two or three branches to the 

 glutei muscles. 



Vesical.'^^ — Arises from the remains of the umbilical, or from the 

 internal iliac, and is spent upon the bladder. There is sometimes an 

 inferior vesical. ^^ 



Middle hcemorrhoidal}^ — Is of variable size and origin. It is 

 distributed to the rectum, vesiculse seminales and prostate gland. 



Ischiatic}* — Is the anterior of the two principal trunks of the 

 internal iliac. It passes out of the pelvis through the sciatic notch, 

 between the pyriformis muscle and great sacro-sciatic ligament. It 

 supplies the muscles on the floor of the pelvis and back of the thigh. 



Internal pudic.'^^ — Arises from the last, previous to its emergence 



