146 THE SUPERIOR EXTREMITY 



passing superficial to the transverse carpal ligament. In the 

 proximal third of the forearm the ulnar nerve is separated from 

 the ulnar artery by a considerable interval, but in the distal 

 two-thirds it is closely applied to the medial side of the 

 vessel. 



In the forearm the ulnar nerve gives off: 



1. Kami articulares. 



2. Kami Musculares, | to t h 1 fl " or Carpi ulnaris an , d t ! ie medial P art 



^ 01 tne nexor digitorum profundus. 



3. Kami cutanei, { ramus J-utaneus palmaris. 



^ramus dorsahs manus. 



The articular branches spring from the ulnar nerve as it 

 lies in the interval between the olecranon and the medial 

 epicondyle of the humerus, and pass to the elbow-joint. 



The muscular branches are given off immediately distal to 

 the articular branches. They supply the flexor carpi ulnaris 

 and the medial part of the flexor digitorum profundus. 



The palmar cutaneous branch is a minute twig which has 

 already been seen piercing the fascia of the forearm, im- 

 mediately proximal to the transverse carpal ligament. It arises 

 about the middle of the forearm and proceeds distally upon 

 the ulnar artery, to be distributed in the palm of the hand. 



The dorsal branch is a nerve of some size which springs 

 from the ulnar trunk about 6-7-5 cm - ( two an d a half or 

 three inches) proximal to the wrist. It winds round the 

 medial margin of the forearm, under cover of the flexor carpi 

 ulnaris, and reaches the dorsum of the hand immediately 

 distal to the prominence formed by the distal end of the ulna. 

 From that point onwards it has been traced in the superficial 

 dissection (p. 71). 



Nervus Medianus. As its name implies, the median nerve 

 passes down the middle of the forearm. 



In the proximal part of the forearm the median nerve lies in 

 the cubital fossa upon the medial side of the ulnar artery. 

 It leaves the fossa by passing between the two heads of the 

 pronator teres, and as it does so it crosses the ulnar artery, 

 but is separated from it by the ulnar head of the muscle. 

 From that point the median nerve runs distally between the 

 flexor digitorum sublimis superficially and the flexor digitorum 

 profundus deeply. Near the wrist it becomes superficial, and 

 lies in the interval between the tendons of the palmaris longus, 

 on the medial side, and the flexor carpi radialis, on the lateral 



