Chap. 34-] [ 243 1 



CHAP. XXIV. 



GENERAL DISTRIBUTION OF THE ARTERIES; 



The Aorta* The coronary Artery. Tht carotid and /ubclavian 

 Arteries.- The intercojial Arteriet. Bronchial Arteries. Tht 

 Caeliac Artery*- Mefenteric Arteries. Renal Arteries. Lumbar 

 Arteries. Iliac Arltries.C rural Artery** Pulmonary Artery, 



FROM the pofterior, inferior, or left ventricle 

 of the heart proceeds the principal artery of the 

 body, called the aorta. Immediately on leaving the 

 heart it fends off two fmall arteries, called the coro- 

 nary, which are diftributed on the heart itfelf. The 

 aorta now rifes three or four inches above the heart, 

 when if is turned backwards and towards the left fide, 

 forming an arch over the left divifion of the windpipe. 

 From the convex fide of i:s arch, the aorta fends off 

 three large arteries, which go to the head and arms. 

 The firft of thefe is equal to the two other in fize, 

 and foon divides into two branches j of thefe one is 

 the right carotid artery^ which is diftributed on the 

 right fide of the head ; the other is the right fubcla- 

 vian, which proceeds to the right arm. The arteries 

 \vhich belong to the left fide of the head and left arm 

 arife feparately from the aorta, and are the two other 

 branches which were mentioned as being fent off from 

 its arch. 



Upon meafuring the fides of the veflels, the furface 

 of the united trunk of the right fubclavian and carotid 

 is lefsthan that of the left fubclavian and carotid, which 

 arife feparately - t if fo, the refiftance to the blood muft 

 be lefs in that common trunk than in the left fub- 

 R 2 clavian 



