VASCULAR SYSTEM 47 



(5) The Superior Thoracic Artery, arising a short 

 distance from the thyroid axis, supplies the pec- 

 toral muscle. 



(6) The Long Thoracic Artery, arising a little be- 

 yond the superior thoracic artery, supplies the 

 thoracic muscles. 



(7) The Subscapular and Posterior Circumflex Arteries 

 arise from a common trunk, which is given off 

 from the subclavian a little beyond the long tho- 

 racic. The subscapular artery supplies the muscles 

 of the subscapular region. The posterior circum- 

 flex passes between the subscapular and teres 

 major muscles, and supplies the muscles of the 

 arm. 



(8) The Anterior Circumflex Artery, which runs 

 obliquely around the humerus and supplies certain 

 muscles of the arm. 



The portion of the subclavian artery between 

 the thyroid axis and circumflex artery is known as 

 the axillary artery. After reaching the arm it 

 becomes the brachial artery. 



(9) The Superior and Inferior Profunda Arteries, 

 given off from the brachial, between the shoulder 

 and elbow. 



(10) The Ulnar and Radial Arteries, the two 

 branches into which the brachial divides at the 

 elbow. The radial artery is a direct continuation 

 of the brachial artery, and passes along the flexor 

 surface of the limb to the wrist, where it turns to 

 the dorsal surface, and forms, with a branch of the 



