MEDIAN NERVE. 



707 



ficiai at the roots of the fingers between the slips of the palmar aponeurosis, or, in 

 the case of the nerves to the thumb and lateral side of the index finger, at the lateral 

 edge of the central portion of the palmar aponeurosis. In the fingers they are placed 

 superficial to the digital arteries, and are distributed to the sides and volar aspects 

 of the fingers. Each nerve supplies one or more dorsal branches, distributed to the 

 skin on the dorsal aspect of the terminal phalanx of the thumb and the distal two 



INTERCOSTO- \ 



BRACHIAL 



POSTERIOR ) 

 CUTANEOUS f 



OF ARM ) 



MEDIAL 

 CUTANEOUS 



OF FOR 



AXILLARY 



- - MEDIAL CUTANEOUS 

 (RADIAL) 



DORSAL CUTANEOUS 



OF FOREARM 



ROXIMAL BRANCH) 



( DORSAL CUTANEOUS 

 4 OF FOREARM 

 ((DISTAL BRANCH) 



-V -MUSCULO-CUTANEOUS 



RADIAL 

 (R.SUPERFICIALIS) 



A B 



FIG. 618. THE DISTRIBUTION OF CUTANEOUS NERVES ON THE BACK OF THE ABM AND HAND. 



a schematic representation of the areas supplied by the above nerves, the lettering indicating the spinal 

 . origin of the branches of distribution to each area. D.A.L., Dorsal axial line. 



phalanges of the first two and a half fingers, thus making up for the deficiency of 

 the superficial branch of the radial nerve in those situations. 



Communications. (1) The median nerve, in some cases, receives a communicating 



branch from the musculo-cutaneous nerve in the arm. (2) It communicates in some 



sases, in the proximal part of the forearm, with the ulnar nerve beneath the flexor muscles. 



) It communicates by means of its cutaneous branches with the ulnar nerve in the 



palm of the hand (ramus anastomoticus cum nervo ulnari). 



