THE CIRCULATORY OR VASCULAR SYSTEM 



The thyroid axis is a short trunk, and divides into three 

 branches the inferior thyroid, suprascapular, and trans- 

 versalis colli. 



The superior intercostal artery arises from the sub- 

 clavian, and gives off branches to the intercostal spaces and 

 to the muscles of the dor- 

 sal region; it runs behind 

 the pleura and to the outer 

 side of the sympathetic 

 nerve, and joins the in- 

 tercostal branch from the 

 aorta. 



The profunda cervicis is 

 a branch of the superior 

 intercostal; it unites with 

 branches from the occipital 

 and vertebral arteries, and 

 supplies the several mus- 

 cles of the parts through 

 which it passes. 



The Axillary Artery. 

 We will now consider the 

 axillary artery and its 



FIG. 53. Axillary artery and 

 branches : Ax, Axillary ; B, brachial ; 

 ths, superior thoracic ; tha, acromio- 

 thoracic ; thl, external mammary ; 

 cha, anterior circumflex; chp, pos- 

 terior circumflex; ss, subscapular; 

 esc, circumflex of scapula; i, sub- 

 clavius muscle ; 2, pectoralis muscle ; 

 3, serratus magnus; 4, latissimus 

 dorsi; 5, teres major; 6, long head 

 of triceps; 7, deltoid; 8, subscapular 

 muscle ; 9, bicipital groove (after 

 Henle). 



branches. This artery com- 

 mences at the lower border 

 of the first rib and extends 

 to the lower border of the 



teres major muscle, where it becomes the brachial. 

 relations are as follows : 



Its 



In front, 

 Pectoralis major. 

 Pectoralis minor. 



Inner side. 



First intercostal muscle. 

 Serratus magnus. 

 Brachial plexus. 

 Axillary vein. 



Otiter side. 

 Brachial plexus. 

 Coracobrachialis. 



