INTERNAL CUTANEOUS NERVE. 



and brachialis anticus in the upper arm, and the integument of the 

 outer side of the fore-arm as far as the wrist and hand. 



149.* 



The INTERNAL CUTANEOUS 

 NERVE is one of the internal and 

 smaller of the branches of the ax- 

 illary plexus ; it arises from the 

 plexus in common with the ulnar 

 and internal head of the median, 

 and passes down the inner side of 

 the arm in company with the ba- 

 silic vein, giving off several cuta- 

 neous filaments in its course. At 

 about the middle of the upper 

 arm it pierces the deep fascia by 

 the side of the basilic vein and 

 divides into two branches, ante- 

 rior and posterior. The anterior 

 branch, the larger of the two, di- 

 vides into several branches which 

 pass in front of, and sometimes 

 behind, the median basilic vein at 

 the bend of the elbow, and de- 

 scend in the course of the palmaris 

 longus muscle to the wrist, distri- 

 buting filaments to the integument 

 in their course and communicating 

 with the anterior branch of the 

 external cutaneous on the outer 

 side, and its own posterior branch 

 on the inner side of the fore-arm. 

 The posterior branch sends off se- 

 veral twigs to the integument over 

 the inner condyle and olecranon, 

 and then descends the fore-arm in 

 the course of the ulnar vein as far 

 as the wrist, supplying the integu- 

 ment on the inner side of the fore- 

 arm and communicating with the 

 anterior branch of the same nerve 

 in front, and the dorsal branch of 

 the ulnar nerve on the wrist. 



* The Brachial plexus of nerves with its branches and their distribution. 

 1. The brachial plexus. 2. The short thoracic nerves. 3. The long thoracic 

 or external respiratory of Bell. 4. The phrenic nerve. 5. The supra- scapular 

 nerve. 6. The subscapular nerves. 7. The external cutaneous nerve. 8. The 

 point at which it pierces the coraco-brachialis muscle. 9. The internal cuta- 

 neous nerve ; the point at which it pierces the deep fascia. 10. The origin of 

 the median nerve by two heads. 11. The bend of the elbow where the median 



