THE SPINAL NERVES. 



185 



towards the outer side of the FUca cubiti ; in this course it supplies 

 four branches : 



a. The Bamti^ êuhgcapularii passes dorsally to tlie M. »nh- 



j3. A Bamm pecio- 

 rali^ (Fi^- 123 »/>}, 

 passes forwards to the 

 J/, ahdomino-jjedoralh 

 and to the skin of 

 the pectoral region {B. 

 cuianeu4t ijedoraliîY 



y. The 3'. cuianem 

 anfibrachii superior ft. 

 )iiediaJi4t (kc) passes 

 to the skin of the 

 inner side of the fore- 

 arm ; this and the 

 two followinor nerves 

 are given off near the 

 Piica ciiliti. 



Fig. 12: 



Nerves of the veniral sariaoe of the arm. The band {HouuecL 



rv Uj^r cntaneons bnuic-Ji of the X. radialis. 



re' Txiwer cntaoeoos braitc^ of the X. radialis. 



V X. plnaris. 



me R. cnian. snp. of the X. nlnaris. 



ue' R cnîaiL inf. of the X. nlnaris. 



h. The -A~ cufaneus aniihrachu infenoT #. donaVi* ê. nnt4c»îo- 

 cvtaneui (ifc) at once suppHes branches to the M.jlej'or carpi raili- 

 alk^, and then runs downwards upon the muscle and bifurcates : — 



[i] The B. lafrrali* is distributed, by two twigs, in the M. Hexor 

 carpi vinarii and in the skin of the second finger, to which it sup- 

 phes the Rami digiiale^ rolari* and dormfis. 



[2] The 7?. dormli^t, after gi^*ing a cutaneous twig to the second 

 finger, is distributed by numerous twigs to the skin of the dorsal 

 surface of the hand. 



The -A . ubtari^ then passes between the J/. Hexor carpi radiali^ and 

 the tendon of the J/. »iferno-raâiart^, sinks deeply into the BVim 

 cubiti, where it Hes between the J/. Hexor carpi ra^iaU^ and the 

 Flexor carpi uînaris, then between the latter and the Flexor anfi- 

 brachii mediali^^ on the one side and the Flexor digitoruhi communis on 

 the other : it supplies branches to all these mxiscles, and while still 

 in the forearm divides into two terminal branches : — 



a. The B. uluariê medialiê is the smaller; it runs inwards, 



* As this muscle increases in size daring the breeding season, it ■would be inter- 

 esting to know whetlier a corresponding change takes place in the nerve. 



