514 



DISSECTION OF THE PELVIS. 



Change to adult state. When uterine life has ceased the hypogastric 

 artery diminishes in consequence of the arrest of the current of blood 

 through it, and finally becomes obliterated, more or less completely, as 

 far back as an inch and a half of its commencement. The part of the 

 trunk which is unobliterated becomes the internal iliac ; and commonly a 

 portion of the vessel remains pervious as far as the upper part of the blad- 

 der, and gives origin to the vesical arteries. 



Peculiarities. The length of the internal iliac arteries varies from half an inch to 

 three inches, its extreme measurements ; but in two-thirds of a certain number 

 of bodies (Quain) it ranged from an inch to an inch and a half. 



Size. When the femoral trunk is derived from the internal iliac, and is placed 

 at the back of the thigh, the parent vessel is larger than the external iliac. 



Fig. 176. 



DISSECTION OF THE INTERNAL ILIAC ARTERY (Tiedemann). 



d. External, and g, internal iliac trunk con- 



tinued by au impervious part along the 

 bladder. 



e. Epigastric, and/, circumflex iliac. 

 li. Ilio lumbar. 



f. Lateral sacral. 



/. Middle hsemorrhoidal. 

 k. Obturator. 

 i/i. Glutoal. 

 n. Sciatic. 



0. Pudic. 

 Nerves : 



1, 2, 3, 4. Four highest sacral nerves. 5. Ob- 



turator. 



A. Bladder. 



o. Vas deferens. 



H. Vesicula seminalis. 



B. Lower end of the rectum, 

 c. Levator ani. 



D. Psoas magnus. 

 K. Psoas parvus. 

 F. Iliacup. 

 Arteries : 



a. Aorta splitting into the common iliacs. 



b. Middle sacral branch. 



c. Common iliac. 



A. The three branches arising from 



lie posterior portion of the internal 

 iliac may be first examined. 



The ilio-lumbar branch (fig. 176, hj passes outwards beneath the psoas 



