290 DISTRIBUTION OF THE MESENTER1C ARTERIES. 



and Inferior. The Superior generally anastomoses with that 

 branch of the superior mesenteric, which is called Collect Media, 

 and forms a remarkable arch, called the Great Mesecolic Arch. 

 The ramifications of the other branches frequently anastomose 

 with each other, and are finally spent upon the left portion of 

 the colon. 



The main trunk, diminished by sending off these branches, 

 but still of considerable size, runs downwards on the posterior 

 part of the intestinum rectum, between that intestine and the 

 sacrum, where it often divides into two branches, which con- 

 tinue near to the termination of the rectum. From them proceed 

 many ramifications that are spent upon the rectum. Some of 

 these ramifications anastomose with each other, and others with 

 the branches of the hsemorrhoidal artery, soon to be mentioned. 



Distribution of the Mesenteric Arteries, (see Plate XL facing 



page 290.) 



A. A. The Omentum held up, and bearing the great Arch of the Colon. 



B. The termination of the Intestinum Ileon in the Caput Coli. 

 c. Caput Coli. 



D. E. The Arch of the Colon, which stretches across the belly. 



F. The Sigmoid Flexure of the Colon. 



G. The Rectum. 



H. The Bladder of Urine. 



1. The Aorta. 



2. The Cceliac Artery. 



3. The root of the Upper Mesenteric Artery. 



4. The great Lash of Arteries which go to the small intestines. 



5. The Ileo- Colic Artery. 



6. The Right Colic Artery. 



7. The Middle Colic Artery. 



8. The Lower Mesenteric Artery. 



9. The Left Colic Artery ; this forming a great inosculation betwixt the 

 Upper and Lower Mesenteric Arteries. 



10. The HcBmorrhoidal Artery descending with the Rectum into the Pelvis. 



11. The Emulgent Artery of the left side. 



12. The Spermatic Artery. 



13. The Middle Sacral Artery. 



14. The Common Iliac Artery. 



15. The External Iliac Artery. 



16. The Internal Iliac Artery. 



