DISSECTING MANUAL. 



arteriosum) runs from its under surface to the left pulmonary 

 artery. Its branches are the innominate, left common carotid, 

 and left subclavian arteries. ' [797] 



Descending Aorta. Descending on the front of the spine this 

 becomes the abdominal aorta, opposite the last dorsal verte- 

 bra, on passing through the aortic opening of the diaphragm. 

 Its branches are the intercostal, subcostal, diaphragmatic, vas 

 aberrans, bronchial, cesophageal, pericardial, and mediastinal 

 arteries. [798] 



Right Coronary. Arising from the ascending aorta at the 

 anterior sinus of Valsalva, this runs forward between the pul- 

 monary artery and right auricular appendix; it then passes to 

 the right in the auriculo- ventricular sulcus as far as the inferior 

 interventricular sulcus, dividing into two branches, transverse 

 and interventricular. Branches: aortic and pulmonary, to 

 those arteries; right auricular, to the right auricle in front; 

 marginal, descending along the right margin of the heart; trans- 

 verse, a continuation of the artery round the margin and to the 

 left; interventricular, descending in the interventricular 

 sulcus. [800] 



Left Coronary. Arising from the ascending aorta at the 

 left posterior sinus of Valsalva, this runs forward between the 

 pulmonary artery and left auricular appendix to the auriculo- 

 ventricular sulcus and divides in two branches, terminal and 

 interventricular. Branches: aortic and pulmonary, to those 

 arteries; left auricular, to the left auricle; terminal, running 

 to the left in the auriculo- ventricular sulcus ; and interventricu- 

 lar, descending in the anterior interventricular groove. [800] 



Innominate. Arising from near the right end of the con- 

 vexity of the arch this runs upward, backward, and outward. 

 It divides, opposite the right sterno-clavicular joint, into the 

 right subclavian and right common carotid. Occasionally it 

 sends a branch (thyroidea ima) to the trachea and thyroid 

 body. [801] 



Left Common Carotid. Arising from the convexity of the 



[130] 



