MUSCULO-SPIRAL NERVE. 465 



The Articular branches are several filaments to the elbow-joint, 

 which are given off from the nerve as it lies in the groove between the 

 inner condyle and the olecranon. 



The Muscular brandies in the fore-arm are distributed to the flexor 

 carpi ulnaris and flexor profundus digitorum muscle. 



The Anastomotic branch (n. cutaneus palmaris ulnaris) is a small 

 nerve which arises from the ulnar at about the middle of the fore-arm, 

 and divides into a deep and a superficial branch ; the former accompa- 

 nies the ulnar artery, the latter pierces the deep fascia and is distri- 

 buted to the integument, communicating with the posterior branch of 

 the internal cutaneous nerve. 



The Dorsal branch passes backwards beneath the tendon of the flexor 

 carpi ulnaris, at the lower third of the fore-arm, and divides into 

 branches which supply the integument and two fingers and a half on 

 the posterior aspect of the hand, communicating with the internal cu- 

 taneous and radial nerve. 



The Superficial palmar branch divides into three filaments, which are 

 distributed, one to the ulnar side of the little finger, one to the adjoin- 

 ing borders of the little and ring fingers, and a communicating branch 

 to join the median nerve. 



The Deep palmar branch passes between the abductor and flexor 

 minimi digiti, to the deep palmar arch, supplying the muscles of the 

 little finger, and the interossei and other deep structures in the palm 

 of the hand. 



The MUSCULO-SPIRAL NERVE, the largest branch of the brachial 

 plexus, arises from the posterior part of the plexus by a common trunk 

 with the circumflex nerve. It passes downwards from its origin in 

 front of the tendons of the latissimus dorsi and teres major muscle, 

 and winds around the humerus in the spiral groove, accompanied by 

 the superior profunda artery, to the space between the brachialis 

 anticus and supinator longus, and thence onwards to the bend of the 

 elbow, where it divides into two branches, the posterior interosseous 

 and radial nerve. 



The Branches of the musculo-spiral nerve are, 



Muscular, 



Spiral cutaneous, 



Radial, 



Posterior interosseous. 



The Muscular branches are distributed to the triceps, to the supina- 

 tor longus, and to the extensor carpi radialis longior. 



The Spiral cutaneous nerve pierces the deep fascia immediately 

 below the insertion of the deltoid muscle, and passes down the outer 

 side of the fore-arm as far as the wrist. It is distributed to the 

 integument. 



The Radial nerve runs along the radial side of the fore-arm to the 



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