854 THE NERVOUS SYSTEM OF THE DOG 
the forearm it gives off the dorsal branch (R. dorsalis), which supplies cutaneous 
twigs to the dorso-lateral surface of the distal part of the forearm and carpus and 
terminates as the lateral dorsal digital nerve of the fifth digit. Descending under 
cover of the flexor carpi ulnaris, the ulnar inclines medially under “he tendon of 
insertion of that muscle and divides into superficial and deep branches. The 
superficial branch (R. superficialis) descends along the lateral border of the flexor 
tendons, gives off the lateral volar digital nerve of the fifth digit (N. dig. vol. lat. dig. 
V), and a branch (N. met. vol. IV) which descends in the space between the fourth 
and fifth metacarpal bones and unites with the deep branch. The deep branch 
(R. profundus) descends in the carpal canal and divides under the deep flexor 
Branches of <= 
radial nerve 
Median nerve --—- —- Ulnar 
Dorsal nerve 
branch of ---- 
ulnar nerve Deep 
-—- branch 
--- Swper- 
ficial 
branch 
Dorsal com- __ 
mon digital ~~ 
nreerves 
Fic. 684.—Nerves or Distat Part or Rieut Fore- Fic. 685.—Nerves or Distau Part or Ricut Forp-~ 
LIMB OF Doc; Dorsat View (SCHEMATIC). LIMB OF Dog; VoLar VIEW (SCHEMATIC). 
p, Dorsal proper digital nerves. p, Volar proper digital nerves. 
tendon into its terminal branches. The smaller of these supply the volar meta- 
carpal muscles. The larger terminals are the three volar common digital nerves 
(Nn. dig. col. comm. II, II, IV), which descend along the second, third, and fourth 
intermetacarpal spaces, subdivide, and concur with the volar metacarpal branches 
of the median nerve in forming the volar proper digital nerves (Nn. dig. vol. proprii). 
The median nerve descends behind the brachial artery, passes over the medial 
epicondyle of the humerus, then under the pronator teres, and continues in the 
forearm under cover of the flexor carpi radialis. It gives branches below the elbow 
to the flexor and pronator muscles, and lower down a volar branch to the skin on 
the medial and volar aspect of the carpus, and terminates between the superficial 
and deep flexor tendons by dividing into three volar metacarpal nerves (N. met. vol. 
