DEEP VEINS. 445 



humeral. The artery is always accompanied, and in a great 

 measure enveloped, by three or four venous branches, that freely 

 anastomose, and result from the terminals of the metacarpals. 



The ANTERIOR RADIAL follows a course similar to the anterior 

 radial artery, receiving satellite branches equivalent to those of 

 the latter. 



The ULNAR or cubital accompanies the ulnar artery, receiving 

 muscular and cutaneous branches, terminating at the inferior 

 extremity of the humeral. It is sometimes double in the latter 

 part of its course. 



SUPERFICIAL VEINS. 



The superficial veins of the arm and chest are the external and 

 internal subcutaneous, which are slightly separated from the 

 skin and fascia of the arm ; and the subcutaneous thoracic. 



The INTERNAL SUBCUTANEOUS vein ascends the limb on the 

 inner side of the fore-arm, at the superior extremity of which it 

 passes obliquely forwards, and terminates by two large branches 

 the basilic and the cephalic. The basilic vein crosses the 

 pectoralis transversus, and terminates in the humeral. The 

 cephalic vein passes over the flexor brachii to the interstice 

 between the pectoralis anticus and levator humeri, emptying itself 

 into the jugular vein. 



The EXTERNAL SUBCUTANEOUS vein is much smaller than the 

 internal, and ascends the leg on the anterior surface of the fore- 

 arm, terminating at the superior extremity by uniting either with 

 the internal, or more commonly, the cephalic vein. 



The SUBCUTANEOUS THORACIC or SPUR vein commences by 

 numerous branches in the flank, which unite in one common 

 trunk. Posteriorly it lies near the external surface of the pan- 

 niculus, being directed along the superior border of the pectoralis 

 magnus ; it then dips into the caput muscles, terminating in the 

 humeral, sometimes in the brachial vein. 



DEEP VEINS. 



The HUMERAL vein is a satellite of the corresponding arterv, 

 and lies behind it, commencing above the elbow by the union of 

 the radial and articular branches. It terminates in the brachial 

 vein. 



The BRA'CHIAL vein commences at the scapula-humeral articula- 



