766 



THE NEBVES. 



"When it reaches the interstice of the triceps and anterior brachial, it crosses the limb 

 above the outer face of the elbow, and divides into two series of terminal branches. 



Fig. 351. 



The muscular branch enters beneath 

 the muscles on the anterior face of the fore- 

 arm. The cutaneous bifurcates imme- 

 diately : the smallest branch, passing in- 

 wards, extends beyond the bend of the 

 elbow, lies at the inner border of the median 

 subcutaneous vein, and is distributed to the 

 lower moiety of the fore-arm, the thumb, 

 and internal border of the index digit. The 

 largest lies at the outer side of the median 

 subcutaneous vein; it sends a recurrent 

 ramuscule to the bend of the elbow, and, at 

 the elbow, detaches three filaments to the 

 first, second, and third dorsal intermeta- 

 carpal spaces ; these filaments bifurcate at 

 the dorsum of the digits io constitute the col- 

 lateral dorsal neriies. The first metacarpal 

 nerve anastomoses, by a, fiiiO transverse 

 branch, with the ulnar ramuscule that 

 constitutes the e.'cteinal dorsal collateral of 

 the small digit. 



To resume ; the radial of the Dog gives 

 branches to the dorsal face of all the digits, 

 except the external border of the first digit, 

 or auricularis. 



In the Gat, there are some differences. 

 The internal branch of the radial sometimes 

 lies with the external branch ; it is placed 

 at the inner border of the metacarpus, gives 

 off a filament to the dorsal face of the thumb, 

 and afterwards forms the internal dorsal 

 collateral nerve of the index. The external 

 branch leaves the anterior face of the carpus, 

 and is situated at the origin of the third 

 interosseous space, where it divides in'o 

 three metacarpal branches ; the external of 

 these is very fine, and directed obliquely 

 outwards, anastomosing with the dorsal 

 branch of the ulnar, between the first and 

 second digits. 



The median of the Bog is united to the 

 ulnar as far as the lower fourth of the arm ; 

 it is situated behind the humeral artery, 

 and the filament it receives from the mus- 

 culo-cutaneous joins it at a short distance 

 from the elbow-joint. Placed beside the 

 radial artery, the median is, towards the 

 lower third of the fore-arm, immediately 

 passing to the thumb ; c. Collateral given below the posterior border of the great pal- 

 cfi' by the median; cl, c2, Co, c4, CoUa- mar tendon; it afterwards passes through 

 terals furnished by the median and ulnar, the carpal sheath, giving a branch that 

 — a, Palmar branch of the ulnar ; h, Super- constitutes the internal palmar collaterals 

 ficial branch giving off a filament to the of the thumb, and external of the index; it 

 hypothenar, and a second that forms the finally forms three branches, the first of 

 superficial nervous arch; !)1, Deep branch which anastomoses with the ulnar, at the 

 passing to the muscles of the skin ; m. Not surface of the palmar arch, and is lost on 

 anastomosing with the median ; ml, !)i2, an artery ; the other two, receiving a fila- 

 Anastomosing with the corresponding brancli ment from the ulnar at the origin of the 

 of the median ; the innermost passes to the digits, bifurcate to form the internal palmar 

 muscles of the thumb ; c, c, c. Collaterals collateral of the armularis, and collaterals of 

 furnished by the ulnar the medius and index. The .second gives, 



in addition, a slender branch, that is lost 

 in the internal and middle lobe of the large cushion of the paw. In fine, the median of 



NEBVES OP THE PALMAR FACE; DOG. 



, Trunk of the median dividing into si-^c 

 branches ; El, Branch of the superficial 

 nervous arch ; b2. Branch disappearing on 

 a vessel ; b3, b4. Branches uniting with 

 the corresponding ramuscules of the ulnar ; 

 b5, Branch forming the internal collateral 

 of the index ; b6. Rudimentary branch 



