248 Renal and Lumbar Arteries, &c. [Book IX. 



carefully thefe parts are provided with a fupply of 

 blood. 



The next arteries, which are fent off from the aorta, 

 are the two emulgent or renal. They arife one on 

 each fide, and proceed almoft horizontally to the kid- 

 neys. As the aorta lies towards the left fide of the 

 fpine, the right renal artery is longer than the left. 

 The reverfe is the cafe with the veins, as the vena cava 

 is placed on the right fide of the fpine. 



Above the renal arteries arife two arteries, which 

 go to the glandulas fuprarenales, and which alfo fend 

 branches into, the adipofe membrane which furrounds 

 the kidneys. 



Below the renal ar^ries arife the two fpermatic ar- 

 teries, which are very fmall. They are placed behind 

 the peritoneum, on the pfoas mufcles. 



The lower mefenteric artery arifes from the anterior 

 part of the aorta, below the fpermatic. It is foon di- 

 vided into three or four branches, which gradually- fe- 

 parate from each other. The luperior of thefe branches 

 forms the communication, which was mentioned as 

 taking place between the two mefenteric arteries. The 

 inferior mefenteric artery is diftributed chiefly on the 

 colon 5 it fends, however, a confiderable branch to the 

 rectum, called the arteria haemorroidalis intern*. 



The lumbar arteries proceed in five or fix pairs from 

 the pofterior part of the aorta, much in the fame man- 

 ner with the intercoftals. The fuperior fometimes 

 fend blood to the diaphragm and intercoftals, but they 

 are principally fpent on the pfoas mufcles, the quadrati 

 lumborum, and the oblique and tranfverfe mufcles of 

 the abdomen. One or more arteries are fent off from 

 the lower part of the aorta, or fome of the neighbour- 

 ing arteries, to the os fecrum and large nerves of thefe 

 parts. * 



Near 



