2OO 



ANATOMY AND PHYSIOLOGY 



the side of the body, supplying it freely with blood, and anastomos- 

 ing with the ovarian artery. 



The arteries of the organs in the lower part of the pelvis are 

 numerous. There are: three (or four) vaginal arteries, three (or 

 more) vesical arteries, three or more hemorrhoidal arteries, all 

 derived from the hypogastric or its branches, except the superior 

 hemorrhoidal which is the terminal portion of the inferior mesenteric. 



Right iliac 

 artery 



Middle sacral 



Colic artery 



Iliac vein 

 Sigmoid vessels 



Superior 

 hemorrhoidal 



Rectum 



FIG. 137. INFERIOR MESENTERIC ARTERY. (Morris.} 

 Supplying a portion of large intestine only, ending as hemorrhoidal. 



There are also two perineal arteries. 



These all anastomose freely with each other and with other 

 arteries, so that a wound in this region is followed by an abundant 

 flow of blood from more than one vessel. 



Note. The hypogastric arteries in the fetus are large. After 

 giving off their branches they turn upward to the umbilicus where 



