ULNAE NERVE 189 



turn over the tops of the fingers and supply the posterior surface 

 of the terminal phalanges. 



Ulnar nerve arises from the inner cord of the brachial plexus. 

 It lies between the axillary artery and vein, and passes down on 

 the inner side of the brachial artery in front of triceps. In the 

 lower half of the arm it passes behind the internal intermuscular 

 septum with the inferior profunda artery lying anterior to the 

 inner head of triceps, and reaches the interval between the 

 internal condyle of the humerus and the olecranon process. It 

 enters the forearm between the two heads of flexor carpi ulnaris 

 and passes down between it and flexor profundus digitorum on 

 the inner side of the ulnar artery. It passes into the hand over 

 the anterior annular ligament on the radial side of the pisiform 

 bone, and divides beneath palmaris brevis into its terminal 

 branches. 



Branches. There are none in the upper arm. 



In the forearm : Articular to the elbow-joint. 



Muscular to flexor carpi ulnaris and the inner half of flexor 

 profundus digitorum. 



Cutaneous. Palmar supplies the skin over the ulnar side of 

 the wrist, the hypothenar eminence, and ulnar side of palm. 

 Dorsal supplies the skin on the ulnar side posterior surface of 

 wrist and hand, the little finger and ulnar side of third finger. 



In the hand : Muscular to palmaris brevis. It then divides 

 into terminal branches superficial and deep. 



Superficial. Cutaneous to anterior surface of little finger and 

 ulnar side of third finger. 



Deep. Muscular to all the muscles of the hand except those 

 supplied by the median nerve. 



Internal Cutaneous nerve arises from the inner cord of the 

 brachial plexus. In the upper part of its course it lies super- 

 ficial to the artery and the ulnar nerve. It then pierces the 

 deep fascia about the middle of the inner side of the arm, and 

 accompanies the basilic vein to the elbow, where it divides into- 

 its two terminal branches. 



Branches. In the upper arm a branch which supplies the 

 lower half of the anterior surface on its inner side. 



In the forearm there are two branches one supplies the 



