372 ABRAM T. KERR 



43. The nerve to the coracobrachiaHs muscle arises from the 

 musculocutaneous in over 40 per cent of the plexuses and from 

 the lateral fasciculus of the plexus in over 20 per cent. 



44. The nerve to the coracobrachialis muscle is represented by 

 a single branch in over 55 per cent of the cases; by 2 branches 

 in over 31 per cent; by three branches in over 10 per cent; and 

 by four branches in over 2.5 per cent. 



45. In over 84 per cent none of the nerves of the plexus cephalic 

 to the eighth cervical can be excluded from sending fibers to the 

 coracobrachialis muscle. 



46. The suprascapular nerve arises from the cephalic trunk 

 of the plexus in over 62 per cent of the cases and from the cephalic 

 trunk or its dorsal or ventral division in over 82 per cent. Fibers 

 of the fifth and sixth cervical nerves may enter the nerve in all 

 of these cases and the fourth also may send fibers in two-thirds 

 of them. 



47. The subclavius nerve in nearly 50 per cent of the cases 

 arises from the cephalic trunk of the plexus or its ventral branch. 

 In nearly two-thirds of these the fourth, fifth and sixth cervical 

 nerves may send fibers to it. In over 26 per cent of the cases, 

 it arises from the fifth cervical nerve only and in over 21 per 

 cent it may receive fibers from both fourth and fifth cervical 

 nerves. 



48. The subclavius nerve arises as a single branch in over 65 

 per cent of the cases and from a stem that communicates with 

 the phrenic nerve in over 28 per cent of the cases. 



49. The medial brachial cutaneous nerve is represented by a 

 single branch in over 82 per cent of the cases. 



50. In over 73 per cent of the cases, the medial brachial cutane- 

 ous nerve arises separately. When combined it is most often 

 with the medial antibrachial cutaneous nerve. 



51. The fibers of both the first thoracic and eighth cervical 

 nerves may enter the medial brachial cutaneous nerve in over 

 95 per cent of the cases. 



52. Anastomoses of the medial brachial cutaneous nerve with 

 the intercostobrachial is found in over 60 per cent of the cases. 



53. In over 82 per cent of the plexuses the medial antibrachial 



