THE POSTERIOR AORTA. 



137 



artery forms a considerable branch of the coeliac : in its course 

 to the liver it gives a branch to the duodenum ; as well as one 

 which supplies the pyloric extremity of the stomach. The 

 splenic in its course sends blood to the pancreas ; and then 

 runs between tlie spleen, and the great curvature of the 

 stomach ; being in this place called the left gastric, which 

 unites with the gastric, enclosing the stomach as in a sling. 



FIG 13. 



THE LENGTH OF THE POSTERIOR AORTA EXPOSED. 



1, Tlie aorta. 



2, The pulmonary arteiy. 



3, The left coronary. 



4, The posterior aorta. 



5, The left bronchial. 

 (i, The oesophageal. 



7, The intercostals. 



8, The left phreuic. 



9, The coeliac. 



a, The splenic. 



b, The gastric. 



c, Arteries derived from the gastric. 



d, The hepatic. 



e, The anterior mesenteric. 

 /, The renal. 



g, g. The spermatics. 



h. The posterior mesenteric. 

 i. The lumbar arteries. 

 j. The left external iliac. 

 k, The left internal iliac. 

 I, The right external iliac. 

 »B, The circumflex artery of the ilium. 

 n, The profunda femoris. 

 0, The epigastric. 



The mesenteries , anterior and posterior {Fig 13 . e, A), are two 

 considerable branches given off from the aorta : the posterior 

 being generally the last vessel emerging from the aorta; the first 

 leaves the parent trunk, directly after the cceliac. The anterior 

 is distributed to the mesentery and small intestines ; giving a 

 small branch to the pancreas. The posterior furnishes most 

 of the large intestines ; excepting a portion of the rectum. 

 The mesenteries anastomose freely with each other by a 

 particular branch ; and surround the intestines, so as to 

 form a network of vessels. The emulgents, or renals, are 



