936 



NEUROLOGY 



the arm it supplies the Coracobrachialis, Biceps brachii, and the greater part of the 

 Brachialis. The branch to the Coracobrachialis is given off from the nerve close 

 to its origin, and in some instances as a separate filament from the lateral cord 

 of the plexus; it is derived from the seventh cervical nerve. The branches to the 

 Biceps brachii and Brachialis are given off after the musculocutaneous has pierced 



I 



Flo. 813. Cutaneous nerves of right upper 

 extremity. Posterior view. 



FIG. 814. Diagram of segmental distribution of the cuta- 

 neous nerves of the right upper extremity. Posterior view. 



the Coracobrachialis; that supplying the Brachialis gives a filament to the elbow- 

 joint. The nerve also sends a small branch to the bone, which enters the nutrient 

 foramen with the accompanying artery. 



The lateral antibrachial cutaneous nerve (n. cutaneus antibrachii cutaneous lateralis; 

 branch of musculocutaneous nerve} passes behind the cephalic vein, and divides, 

 opposite the elbow-joint, into a volar and a dorsal branch (Figs. 811, 813). 



