338 SUBCLAVIAN VEIN FEMORAL VEIN. 



SUBCLAVIAN VEIN. 



The subclavian vein crosses over the first rib and beneath the 

 clavicle, and unites with the internal jugular vein to form the vena 

 innominata. It lies at first in front of the subclavian artery, and 

 then in front of the scalenus anticus, which separates it from that 

 vessel. The phrenic and pneumogastric nerves pass between the 

 artery and vein. The veins opening into the subclavian are the 

 cephalic below the clavicle, and the external and anterior jugulars 

 above ; occasionally some small veins from the neighbouring parts 

 also terminate in it. 



VEINS OF THE LOWER EXTREMITY. 



The veins of the lower extremity are the deep and superficial. 

 The deep veins accompany the branches of the arteries in pairs, and 

 form the venae comites of the anterior and posterior tibial and pero- 

 neal arteries. These veins unite in the popliteal region to form a 

 single vein of large size the popliteal which successively becomes 

 in its course the femoral and the external iliac vein. 



POPLITEAL VEIN. 



The popliteal vein ascends through the popliteal region, lying, 

 in the first instance, directly upon the artery, and then getting some- 

 what to its outer side. It receives several muscular and articular 

 veins, and the external saphenous vein. The valves in this vein are 

 four or five in number. 



FEMORAL VEIN. 



The femoral vein, passing through the opening in the adductor 

 magnus muscle, ascends the thigh in the sheath of the femoral artery, 

 and entering the pelvis beneath Poupart's ligament, becomes the 

 external iliac vein. In the lower part of its course it is situated upon 

 the outer side of the artery; it then becomes placed behind that ves- 

 sel, and, at Poupart's ligament, lies to its inner side. It receives 

 the muscular veins, and the profunda, and, through the saphenous 

 opening, the internal saphenous vein. The valves in this vein are 

 four or five in number. 



The Profunda vein is formed by the convergence of the numerous 

 small veins which accompany the branches of the artery; it is a 

 vein of large size, lying in front of the profunda artery, and ter- 

 minates in the femoral at about an inch and a half below Poupart's 

 ligament. 



The Superficial veins are the external or short, and the internal 

 or long saphenous. 



The External saphenous vein collects the blood from the outer 



