138 



AXILLARY. 



Inferior thyroid,'' ascends obliquely from the subclavian and sup- 

 plies the thyroid gland, giving off the ascending or superficial cer' 

 vical.^ 



Superior intercostal,'^* arises from the subclavian, and descending, 

 supplies the two upper intercostal spaces. 



Internal mammary ^^ is , larger than the last, and entering the 

 cavity of the thorax, descends within a few lines of the sternum, 

 giving off branches to the diaphragm, thorax, and abdomen. 



Posterior cervical,^^ arises from the subclavian in an irregular 

 manner, and winding round the root of the neck, supplies the 



muscles upon its back. Another 



^^' ^^^' large artery is frequently given off 



from the subclavian called profunda 



cermcis}^ The subclavian artery, 



. ^^^^^ [i^ passing under the subclavian muscle, 



is afterwards called axillary. 



AXILLARY. 



The branches of this artery may 

 also be considered five in number, 

 although there is great irregularity 

 in their mode of origin. 



Supra-scapular. — This usually 

 arises from the axillary, but some- 

 times from the thyroid axis, as is 

 seen in the last figure.*^ It passes 

 over the scapula, and supplies its 

 muscles, sending a branch through 

 the coraccid notch. 



External mammaries. — Usually 

 are four in number, arising singly or 

 together, from the axillary. They 

 are the acrmnial thoracic,^^ distri- 

 buted upon the shoulder ; superior 

 and inferior thoracic,^^ which are 

 long ^branches, upon the pectoralis 

 major and serratus magnus muscles, 

 and the axillary thoracic, which is 

 distributed to the fat and glands of the axilla. 



Scapular.^* — This is the largest branch of the axillary ; it passes 

 along the lower border of the subscapular muscle, and gives off a 

 large branch called dorsalis scapulce, which anastomoses with the 

 super-scapular. 



Anterior and Posterior Circumflex, arise from the axillary, oppo- 

 site the neck of the humerus. The anterior is small and supplies 



