210 HUMAN ANATOMY. 



The subclavian vein, the continuation of the axillary,, unites 

 with the internal jugular to form the innominate. In its pas- 

 sage over the first rib it is separated from the artery by the 

 scalenus anticus muscle. 



Deep Set. The deep veins accompany the corresponding 

 arteries and form the venae comites, one on either side, except the 

 axillary, which has a single vein. The valves are more numer- 

 ous in the deep set. About the middle of the arm one of the 

 brachial veins receives the basilic vein, one of the larger veins 

 of the superficial set. The two brachial veins unite with the 

 basilic to form the axillary vein, which in turn becomes the 

 subclavian vein, receiving in its course beneath the clavicle the 

 cephalic vein, a branch of the superficial set. 



Superficial Set. The anterior ulnar vein commences on the 

 inner surface of the hand and wrist, and terminates by uniting 

 with the posterior ulnar or the median vein. The posterior ulnar 

 vein commences on the inner back portion of the hand, anasto- 

 mosing with the radial cutaneous vein, and ascends to the bond 

 of the elbow, where it becomes the basilic vein ; 



The basilic vein, from its formation at the bend of the elbow, 

 ascends the inner side of the biceps, pierces the fascia, to join 

 the brachial vein. 



The radial cutaneous commences on the radial, dorsal aspect 

 of the hand, and at the bend of the elbow unites with the median 

 cephalic, to become the cephalic. 



The cephalic vein ascends along the outer border of the 

 biceps, and above in the groove between the deltoid and pectoralis 

 major, and passes beneath the clavicle, to end in the axillary. 



The median vein receives the blood from the palmar surface 

 of the hand and the front of the forearm, and usually divides 

 into two branches the median cephalic, passing outward to 

 join the cephalic, and the median basilic, passing inward to join 

 the basilic. The median basilic vein, the larger, is the one 

 usually selected for plebotomy. 



VEINS OF THE TRUNK. The vena azygos major commences 

 in the abdomen, opposite the first or second lumbar vertebra, as 

 a continuation upward of the right ascending lumbar vein. It 

 communicates with the right renal and the inferior vena cava. 

 Through the lumbar veins it establishes communication with the 

 right common iliac vein. It passes through the aortic opening 

 of the diaphragm, or through an aperture in the right crus, 

 ascends on the dorsal vertebrae, arches over the root of the right 

 lung, and empties into the superior vena cava. It is in relation 

 on its left side with the aorta, thoracic duct, and resophagus. It 

 receives 



