SHOULDER AND ARM. 



ing low down and running inward on the Brachialis anticus, 

 through the internal intermuscular septum, and then outward 

 under the Triceps to the back of the external condyle. All the 

 branches reaching the condyles anastomose with each other 

 and the branches of the radial and ulnar, viz. : External con- 

 dyle ; (anteriorly) anterior branch of superior profunda, radial 

 recurrent; (posteriorly) posterior branch of superior profunda, 

 anastomotic, posterior interosseous recurrent. Internal con- 

 dyle: (anteriorly) anastomotic, anterior ulnar recurrent; 

 (posteriorly) inferior profunda, anastomotic, posterior ulnar 

 recurrent. [8313 



VEINS. 



The veins are in two sets, superficial and deep. The deep 

 veins, except the axillary, which is single, accompany (venae 

 comites) the arteries in pairs. The superficial veins do not 

 accompany arteries. [888] 



Axillary. Beginning at the lower border of the Teres major, 

 as a continuation of the basilic, this ascends internal to the 

 artery and becomes the subclavian at the outer border of the 

 first rib. Besides tributaries corresponding to the arterial 

 branches it receives the brachial vena? comites at the lower 

 border of the Subscapularis, arid the cephalic at the upper 

 border of the Pectoralis minor. [888] 



Superficial Veins. The basilic is formed at the inner side of 

 the bend of the elbow by the union of the median basilic and 

 posterior ulnar. Ascending along the inner border of the Bi- 

 ceps to the middle of the arm, it runs through an opening (hia- 

 tus semilunaris) in the deep fascia, continues deeply along the 

 inner side of the brachial artery, and becomes the axillary at 

 the lower border of the Teres major. The cephalic is formed at 

 the outer side of the bend of the elbow by the union of the 

 radial and median cephalic. It ascends along the outer bor- 

 der of the Biceps and then, piercing the deep fascia, between 



[167] 



