THE BRACHIAL PLEXUS 



139 



external cutaneous branches of musculo-spiral), which supply 

 the antero-lateral aspect of the arm and the middle part of the 



FIG. 64. The Nerve-supply of the Skin on the Dorsal Aspect 

 of the Upper Limb. 



A. The segmental supply. 



B, The individual nerves of supply. 



1. Posterior supra-clavicular nerves. 



2. Lateral cutaneous nerve of arm. 



3, 4. Dorsal cutaneous nerve of forearm 

 (upper and lower external cutane- 

 ous branches of musculo-spiral 

 nerve). 



5. Lateral cutaneous nerve of forearm. 



6. Superficial division of radial nerve. 



7. Dorsal cutaneous branch of ulnar 



nerve. 



8. Medial cutaneous nerve of forearm 



(internal cutaneous nerve). 



9. Intercosto-brachial nerve. 



10. Posterior cutaneous nerve of arm (in- 

 ternal cutaneous branch of musculo- 

 spiral nerve). 



dorsum of the forearm, respectively (Fig. 64). After piercing 

 the lateral intermuscular septum and re-entering the anterior 

 compartment of the arm, the radial (musculo-spiral) nerve sends 



