THE SUPEKFICIAL VEINS OF THE SUPEKIOK EXTEEMITY. 979 



Subclavius 



Cephalic v 



Deltoid. 



P. 



the distal part of the forearm, and runs proxirnally, parallel with the volar border 

 of the brachioradialis muscle, to the cubital region. There, frequently much 

 reduced in size, it turns laterally and runs, 

 along the lateral border of the prominence 

 of the biceps, to the interval between the costo-coracoid membrane 

 deltoid and pectoralis major, along which 

 it ascends to the delto-pectoral triangle. 

 At the delto-pectoral triangle it turns 

 medially, between the pectoralis minor and 

 the pectoralis major, to the anterior aspect 

 of the costo-coracoid membrane, which 

 separates it from the front of the first part 

 of the axillary artery ; then, turning back- 

 wards, it pierces the costo-coracoid mem- 

 brane and ends in the axillary vein. In 

 a few cases instead of piercing the costo- 

 coracoid membrane it crosses the front of 

 the clavicle, deep to the platysma, pierces 

 the deep cervical fascia, and joins the lower 



rt of the external jugular vein. 



As it runs proxirnally, on the volar 

 aspect of the forearm, a number of tribut- 

 aries join its lateral border. Some of these 

 commence in the dorsal venous arch of the 

 hand and others in the superficial fascia of 

 the dorsal aspect of the forearm. 



In the cubital region it is connected 



ith the basilic vein by a large obliquely 

 ed anastomosing channel, the median 



bital vein, which runs along the medial 



rder of the distal part of the biceps pro- 



inence, superficial to the lacertus fibrosus 



hich separates it from the distal part of 



.e brachial artery. In the delto-pectoral 

 ngle it is joined by tributaries which 



rrespond with the acromial and pectoral 

 nches of the thoraco-acromial artery. 

 The median cubital vein not only con- 

 ts together the cephalic and basilic 



ins but it receives also the profunda vein 

 which pierces the deep fascia and connects 

 it with the deep veins of the forearm, and 

 one or more superficial veins, of varying size 

 which pass, proxirnally, along the volar 

 aspect of the forearm. 



In many cases the median cubital vein 

 is relatively very large, and in such cases 

 the more proximal part of the cephalic 

 vein, which lies in the arm, is a compara- 

 tively small vessel. 



The basilic vein commences in the ulnar 

 end of the dorsal venous arch of the hand. 

 It runs along the dorsal aspect of the 

 forearm to the junction of the proximal 

 and middle thirds, where it turns round 

 the ulnar border of the forearm, and runs, anterior to the medial epicondyle of the 

 humerus, to the medial bicipital groove. At the middle of the arm, it pierces 

 the deep fascia. After piercing the fascia, it runs proxirnally, along the medial 

 border of the brachial artery, to the axilla, and there becomes the axillary vein. 



790. SDPEKFICIAL VEINS ON THE FLEXOR 

 ASPECT OF THE UPPER EXTREMITY. 



