other branch extends along the posterior face of the radius to the radial 

 head of the flexor perforans to which it is distributed. Continue the dis- 

 section of the N. medianus in its course beneath the flexor carpi internus. 

 Near the distal third of the antebrachium the nerve (PL III, 24) divides 

 into two terminal branches one of which unites with a branch of the N. 

 ulnaxis as already seen, and with it forms the N. volaris lateralis (PI. Ill, 

 26) ; the other terminal branch of the N. medianus forms the N. volaris 

 medialis (PI. Ill, 2-]). 



N. volaris lateralis, as already stated, is formed by the union of two branches, 

 one from the N. ulnaris and the other from the N. medianus. The N. 

 volaris lateralis, accompanied by a small artery (A. metacarpea volaris 

 lateralis) and vein, crosses the carpus at the medial side of the pisiform 

 bone, in a special channel in the carpal sheath. At the proximal end of 

 the metacarpus the nerve gives off a large branch to the suspensory ligament ; 

 before tracing this branch however, follow the N. volaris lateralis as far 

 as to the fetlock noting the branch of considerable size from the N. volaris 

 medialis that joins it a little proximal to the distal end of the rudimentary 

 metacarpal (PL III, 28). Transect the two flexor tendons near the middle 

 of the metacarpus taking care not to injure the N. volaris medialis and the 

 large artery and vein at the medial side of the tendons (PL III). Reflect 

 the proximal portion of the tendons and carefully trace the branch from 

 the N. volaris lateralis to the suspensory ligament to which it supplies 

 more small branches and also two branches that accompany the respective 

 two or arteries metacarpea volaris medialis and lateralis. 



A. retis carpi volaris is a small vessel which arises from the A. radialis 



posterior near the distal third of the antebrachium and descends to the 

 posterior surface of the carpus where it divides into several small branches 

 which help to form the rete carpi volar e. 



A. metacarpea volaris lateralis. This is the smallest of the three branches 

 that continue the A. radialis posterior. It arises from the lateral side of 

 the A. radialis posterior, crosses the medial face of the pisiform bone, with 

 the N. volaris lateralis, and continues to the proximal end of the meta- 

 carpus. Here it is connected with the A. metacarpea volaris medialis 

 usually by two transverse branches, thus forming the arcus volaris pro- 

 fundus. The larger of the two transverse branches lies between the sub- 

 carpal or inferior check ligament of the perforans tendon and the suspensory 

 ligament: the other transverse branch, not always present, lies between 

 the suspensory ligament and the large metacarpal bone. Cut the suspen- 

 sory ligament near the middle and draw it aside. Below the deep vascular 



