THE CIRCULATORY OR VASCULAR SYSTEM 1 05 



obliquely upward and outward to the inner border of the 

 scalenus anticus muscle; on the left side it passes upward 

 to the inner border (not outward). The second portion 

 curves outward behind the same muscle; the third passes 

 downward and outward beneath the clavicle to the lower 

 border of the first rib, where it becomes the axillary artery. 



n m 



FlG. 52. Subclavian artery: Ab, Innominate; Cc, common carotid; S, 

 subclavian ; v, vertebral ; ba, basilar ; mmi, internal mammary ; es, superior 

 epigastric ; mp, musculophrenic ; is, superior intercostal ; cvp., deep cervical ; 

 ft. inferior thvroid ; cva, ascending cervical ; cvs, superficial cervical ; is, 

 tc, posterior scapular (after Henle). 



suprascapulai 



The branches which this important artery furnishes are 

 the following : 



Vertebral. 

 Internal mammary. 



Thyroid axis : 

 Superior intercostal. 



( Inferior thyroid. 



< Suprascapular. 



( Transversalis colli. 



