THE CIRCULATORY OR VASCULAR SYSTEM '12J 



are associated with the artery of the same vein, and 

 terminates in the femoral vein, below Poupart's ligament. 



The short saphenous vein begins in the arch on 

 the dorsum of the foot; it ascends the outer and back 

 part of the leg, receives many branches from the posterior 

 part of the leg, and perforates the deep fascia to terminate 

 in the popliteal vein. 



The long saphenous vein begins at the inner end of 

 the arch on the dorsum of the foot, and passes to the inner 

 part of the ankle; it then ascends to the knee, passes be- 

 hind the condyle of the femur upward to the saphenous 

 opening, where it enters the femoral sheath and terminates 

 in the femoral vein below Poupart's ligament. It receives 

 the cutaneous veins of the thigh, and unites with many 

 deep branches. At the saphenous opening it unites with 

 the superficial epigastric and superficial circumflex iliac 

 veins, as well as with the superficial external pudic. 

 This vein is of importance, for in phlebitis of the lower 

 extremity it is generally implicated; in the varicosity 

 which occurs in the leg it is also this venous trunk that is 

 usually involved. 



VEINS OF THE TRUNK 



The innominate veins are two large trunks, formed 

 one on each side, by the union of the internal jugular and 

 subclavian. The right innominate unites with that o'f the 

 opposite side and forms the superior vena cava ; it receives 

 the right internal mammary and the right inferior thyroid 

 veins. The left innominate passes obliquely across the 

 chest, and unites with the right innominate to form the 

 superior vena cava. 



The superior vena cava is a short branch, about 

 3 inches in length, formed by the union of the two in- 

 nominate veins; it enters the pericardium and terminates 

 in the right auricle of the heart. 



