190 



ANATOMY FOR NURSES 



[Chap. XI 



below and to the left of the umbilicus. Its length is about five 

 inches (125 mm.). 



The important branches arising from the aorta may be outlined 



as follows : — 



Ascending Aorta — Coronary arteries. 



C Innominate. 

 Arch of Aorta \ Left common carotid. 

 I Left subclavian. 

 Intercostal. 

 Pericardial. 

 Thoracic Aorta I Bronchial. 



(Esophageal. 

 . Posterior mediastinal. 



Cceliac axis. 



Aorta < 



Abdominal Aorta 



Superior mesenteric. 

 Inferior mesenteric. 

 Visceral group < Renal arteries. 

 Supra-renal. 

 Spermatic. 

 ^ Ovarian. 



I Phrenic. 

 Lumbar. 

 Middle sacral. 



The coronary arteries. — The right and left coronary arteries 

 arise from the aorta immediately above the semilunar valves. 

 (See Fig. 10-1.) They encircle the heart and give off numerous 

 branches that supply the substance of the heart. 



Innominate. — The innominate (brachio-cephalic) artery arises 

 from the right upper surface of the arch, ascends obliquely toward 

 the right, until, arriving on a level with the upper margin of the 

 clavicle, it divides into the right common carotid and right sub- 

 clavian arteries. Its usual length is from one to two inches (25 to 

 50 mm.). 



The common carotid arteries. — The left common carotid 

 arises from the middle of the upper surface of the arch of the 

 aorta, and the right common carotid arises at the division of the 

 innominate, consequently the left carotid is an inch or two longer 

 than the right. They ascend obliquely on either side of the neck 

 until, on a level with the upper border of the laryngeal prominence 

 (Adam's apple), they divide into two great branches: (1) the 



