NER VES 165 



Palmar branches 



Superficial : supplies palmaris brevis, ends in two digital 

 branches for inner i fingers the outer one communicating 

 with the median. 



Deep : accompanies deep palmar arch ; it supplies the small 

 muscles of the 5th finger, and gives two branches to each 

 interosseous space, one for each set of interossei ; branches 

 are also given to the two inner lumbrical muscles. In the 

 space between the thumb and index finger the nerve ends by 

 supplying the adductor obliquus, adductor transversus, and 

 inner head of the flexor brevis pollicis. 



Musculo-spiral (posterior cord) : winds round between outer 

 and inner heads of triceps in the musculo-spiral groove with 

 superior profuncla artery to the outer side of arm. Piercing 

 the external intermuscular septum, it passes to the external 

 condyle between the supinator longus and brachialis anticus, 

 where it divides into radial and posterior interosseous nerves. 



Branches in the Arm : 



Muscular : to the three heads of the triceps, to the anconeus, 

 supinator longus, extensor carpi radialis longior, and brachialis 

 anticus. 



Cutaneous : Internal, comes off near axilla, supplies integu- 

 ment on back of arm to near olecranon. External (2), upper 

 one perforates outer head of triceps, accompanies cephalic 

 vein to elbow, supplying the integument of the lower half of 

 arm in front. Lower one supplies integument of lower part 

 of arm, and back part of radial side of forearm as far as the 

 wrist. 



Terminal branches : 



Radial : passes down by outer side of radial artery, under 

 cover of the supinator longus, till within 3 inches of the lower 

 end of the radius, where the nerve passes backwards beneath 

 the tendon of the supinator longus, and, becoming cutaneous 

 by piercing the fascia on outer side of forearm, divides into 

 two branches : 



External : supplies ball and outer border of thumb, joining 

 with the external cutaneous nerve. 



Internal : joins a branch of the external cutaneous and 

 dorsal of ulnar. It gives off four dorsal digital nerves, thus : 

 ist to inner side of thumb, 2nd to outer side of index, 3rd to 

 adjacent sides of index and middle, 4th to adjacent sides of 

 middle and ring fingers. It thus corresponds in its distribu- 

 tion with the median nerve. 



Posterior interosseous : reaches the back of the forearm by 

 piercing the supinator brevis ; there it passes between the 

 superficial and deep layers of muscles to about middle of 



