THE BRACHIAL PLEXUS. 



871 



great palmar tendon : it afterwards passes through the carpal sheath, siving a branch that 

 constitutes the internal palmar collaterals of the thumJt, and external of the index; it finally 

 forms three branches, the first of whicli anastomoses with the ulnar, at the surface of the palmar 

 arcli, and is lost on an artery ; the other two, receiving a filament from the ulnar at the origin 

 of the digits, bifurcate to form the internal palmar collateral of the annularis, and collaterals of 

 the medius and index. The second gives, in addition, a slender branch, that is lost in the 



Fig. 469. 



¥vi 4-70, 



NERVES OF THE PALMAR FACE (DOG). 



A, Trunk of the median dividing into six branches; 

 Bl, 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 passing to 

 the thumb; C, collateral given off by the median; 

 Cl, C2, C3, c4, collaterals furnished by the median 

 and ulnar, a, Palmar branch of the ulnnr; 6, 

 superficial branch giving off a filament to the hypo- 

 thenar, and a second that forms the superficial 

 nervous arch ; 61, deep branch passing to the 

 muscles of the skin ; in, not anastomosing with the 

 median ; ml, m2, anastomosing with the correspond- 

 ing branch of the median ; the innermost passes to 

 the muscles of the thumb; c, c, c, collaterals fur- 

 nished by the ulnar. 



NERVES OF THE PALMAR FACE (CAT). 



A, Trunk of the median dividing into 

 two branches; B, internal branch, 

 giving a rudimentary filament to the 

 thumb, Bl, external branch, receivmg 

 a filament, /, from the ulnar; c, C, C, C, 

 collaterals furnished by the median. 

 a, Palmar branch of the ulnar divid- 

 ing into three branches ; h, internal 

 branch, detaching the filament, /, to 

 the median; 61, external branch; 

 62, deep branch ; c, c, c, collaterals 

 furnished by the ulnar. 



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

 furnishes to all the digits, except the auricularis and external border of the annularis. 



In the Cat, the median traverses the bony canal at the lower extremity of the humerus, 

 and separates below the carpal arch into three branches. The internal branch is destined to 

 the rudimentarv thumb, and the internal palmar border of the index. The middle branch 



