ANGIOLOGY 245 



the epigastric vein. It then passes on the inner side of the thoracic 

 cavity close to the breast-bone and receives many intercostal veins. 

 The vena cava sinistra receives first, the -vena proventricularis 

 communis, which collects the blood from the walls of the proven- 

 triculus, and second, the vena coronaria cardis magna. This latter 

 vein originates close to the apex of the heart and collects blood 

 principally from the walls of the left ventricle. It connects in 

 the left sulcus transversus with the vena cardis superior and ends 

 at the base of the left upper vena cava. Its exit is not guarded 

 by a valve. The veins of the right ventricle are partly on the 

 surface. They collect blood along the sulcus transversus dexter 

 and enter directly into the right ventricle. The veins of the front 

 part of the heart are small. They collect behind the sulcus coro- 

 nalis and end either directly into the right auricle or into the vena 

 cardis magna. 



VEINS OF THE FORE LIMB 



The vena radialis profunda accompanies the radial artery on the 

 dorsal anterior rim of the index -finger and passes, on the dorsal 

 side, over the carpal region. It passes through the interosseous 

 ligament between the ulna and the radius, and reaches the ventral 

 surface of the arm. At this point it passes upward and anastomoses 

 with the vena ulnaris. It collects the blood from the skin of the 

 anterior wing region and the flexor muscles of the anterior arm. It 

 empties into the vena brachialis. 



The vena humeri profunda (Fig. 68, No. i) emerges at the height 

 of the elbow, and collects blood from the skin of the dorsal surface 

 of the wing. It also receives veins from the muscles of the posterior 

 side of the upper arm. It passes subcutaneously and dorsally over 

 the dorsal portion of the humerus in company with the external 

 radial muscle and passes with it around the external part of the hu- 

 merus between the long and short heads of the triceps. It takes a 

 diagonal course to the shoulder cavity and at that point empties into 

 the brachial trunk. 



The profundus ulnaris originates at the volar surface of the hand, 

 proceeds in company with the ulnar artery, and sends on the base of 

 the hand small anastomotic veins to the vena cutanea ulnaris or 

 basilica. It passes along the anterior arm and between the flexor 

 carpi ulnaris and the pronator profundus muscle to the elbow-joint. 

 On the median surface of the biceps it passes upward and anastomo- 



