THE NECTURUS 47 



Gastric 



This artery comes off at a distance of about 50 mm. from 

 the origin of the aorta. It sends branches to the spleen and 

 stomach. 



COELIACO-MESENTERIC 



This artery sends branches to the stomach, intestine, 

 spleen, pancreas, and liver. Gently separate the viscera 

 so as to see the origin from the aorta. It comes off about 

 70 mm. from the origin of the aorta. Trace it to determine 

 the branches to the parts named. 



Posterior Mesenteric Arteries 



These supply the intestines, caudad to the origin of the 

 coeliaco-mesenteric axis, sending off a number of mesen- 

 teric arteries to supply the intestine. Count the number 

 in your specimen. 



Iliac 



This artery supplies the hind leg, sends a branch an- 

 teriorly to the cutaneous, and one to the cloaca and blad- 

 der. Cut through the pelvic arch and the vertebrae for a 

 distance of about 40 mm. caudad to the anus. The iliac 

 comes off from the aorta about 20 mm. cephalad to the 

 anus. It divides into three branches before entering the 

 body wall. The first branch, the epigastric, extends an- 

 teriorly and anastomoses with the cutaneous. The second 

 branch, the femoral, extends along the ischium and en- 

 ters the leg at the head of the femur, where it branches 

 to supply the muscles of the leg. A smaller posterior 

 branch, the hypogastric branches from the iliac and ex- 

 tends caudad to supply the cloaca and bladder. Trace 

 these three branches to the fields that they supply. 



