ARTERIES 63 



Branches : 



Muscular: to neighbouring muscles, ^ecially sterno- 

 mastoid. 



Supra-acromial : through trapezius to acromion ; anas, acro- 

 mio-thoracic. 



Subscapular : arises as suprascapular passes over notch ; 

 anas, in subscapular fossa with posterior scapular and sub- 

 scapular of axillary. 



Injra-spinous : descends on neck of scapula to fossa ; anas. 

 dorsal of subscapular and posterior scapular. 



Articular: to shoulder-joint. Nutrient: to scapula. 



Transverse cervical : over scaleni muscles, phrenic nerve, 

 and brachial plexus, under omohyoid, to outer edge of levator 

 anguli scapulae, there dividing into : 



Superficial cervical : ascends beneath anterior edge of tra- 

 pezius, supplying it together with glands, integuments and 

 muscles of that region ; anas, superficial branch of arteria 

 princeps cervicis. 



Posterior scapular : backwards to superior angle of scapula 

 beneath levator anguli scapula?, then downwards along verte- 

 bral border of scapula under the rhomboids supplying sur- 

 rounding muscles ; anas, supra-scapular, subscapular. 



INTERNAL MAMMARY: from under surface of suDclavian just 

 below thyroid axis, runs down behind clavicle and subclavian 

 vein to posterior surface of ist costal cartilage, being crossed 

 here by phrenic nerve; downwards between pleura and costal 

 cartilages, crossed by intercostal nerves and lying on tri- 

 angularis sterni as far as the 6th space, there dividing into 

 two terminal branches. 



Branches : 



Comes nervi phrenici (superior phrenic) : arises high in chest, 

 accompanies phrenic nerve between pleura and pericardium 

 to diaphragm, supplying it; anas, musculo-phrenic, inferior 

 phrenic. 



Mediastinal : to areolar tissue of anterior mediastinum and 

 thymus gland. 



Pericardiac : to upper part of pericardium. 



Sternal : to triangularis sterni and sternum. 



A nterior Intercostal : to upper five or six intercostal spaces, 

 two in each space ; anastomose with aortic intercostal. 



Perforating : perforate upper five or six intercostal spaces to 

 supply pectoral muscles and mammary gland. 



Musculo-phrenic : external of two terminal branches per 

 forates diaphragm about gth intercostal space, supplying dia- 

 phragm, and branches to lower intercostal spaces. 



