ANATOMY AND PHYSIOLOGY 



Branches oj the arch in their order: 



Two coronary (right and left), .to heart muscle (Fig. 119). 



[ Right subclavian to right 



upper extremity. 



One anonyma, i inches long -r>. , ,., . 



Right common carotid to 



right head and neck. 



One left common carotid .... to left head and neck. 

 One left subclavian ...... to left upper extremity. 



Phrenic nerve 



Subclavian artery 



Subclavian vein 



Anterior intercostal 

 branch 



Branch of mammary 



Common carotid 



Internal jugular vein 

 Subclavian vein 

 Scalenus anterior muscle 



Sternum 



Perforating branches 

 (supplying mam- 

 mary gland) 



Superior epigastric, running 

 down from internal mammary 



Inferior epigastric, running 

 up from external iliac 



FIG. 128. SHOWING SDBCLAVIAN ARTERY AND TWO OP ITS BRANCHES 

 (Thyroid axis and internal mammary). (Morris.) 



THE PRINCIPAL ARTERIES OF THE UPPER EXTREMITY 



The subclavian artery (Fig. 128) passes out over the first rib 

 and under the clavicula (therefore subclavian) to the axilla, or 

 armpit. The brachial plexus lies above it in the neck, and the 



