NERVES OF MAMMALIA. 177 



by the side of the radial flexor and between the digital flexors, 

 through the annular ligament ; it is continued in the fore-paw 

 between the tendons of these muscles, at the division of which it 

 sends off branches ; it gives filaments to the skin of the palm, and 

 a branch to the rudimental pollex, 1 another to the inner side of 

 the index (n), and a branch to be joined by one from the deep 

 palmar for the outer side of the index and the inner side of the 

 meclius (in) ; another branch also to be joined by a branch from 

 the deep palmar for the outer side of the medius and the inner 

 side of the annularis (iv). The ulnar nerve is formed by the 

 first and second dorsals ; it descends behind the inner condyle of 

 the humerus, covered by thick fascia and by part of the flexor 

 sublimis ; it then passes down the fore-arm between the flexors of 

 the fingers and the ulnar flexor of the wrist. In the fore-arm it 

 is larger than the continuation of the median nerve : it sends a 

 branch to the ulnar side of the superficial and deep flexors of the 

 digits and the ulnar flexor of the wrist : near the hand it sends a 

 branch to the back of this part to communicate with the radial 

 branch of the musculo-spiral nerve, and then proceeds to the 

 outer side of the fifth digit (v) ; it passes deeply, confined by a 

 ligament at its entrance, into the palm, and sends a branch for 

 the inner side of the fifth digit and the outer side of the fourth ; 

 the rest of the nerve, forming the deep palmar, divides into 

 branches, which terminate on the interosseous and other small 

 muscles situated in the palm, and give branches to join those of 

 the median sent to the outer side of the index and the inner side 

 of the medius digit ; also to the outer side of this and the inner 

 side of the annularis. The distribution of the median nerve is 

 nearly the same in the Felines, but the trunk traverses the ento- 

 condyloid canal. The musculo-spiral nerve has a slight com- 

 munication with the sixth cervical, but is principally formed from 

 the seventh and first and second dorsals ; it gives branches to the 

 different heads of the triceps muscle, and winds round between 

 the inner and large heads of the triceps to the outside of the arm, 

 and divides into two large branches ; one gives off a cutaneous 

 branch to the outer side of the fore-arm, and then descends in the 

 place of the radial, giving branches to the skin, and dividing to 

 terminate on the skin at the back of the paw and the side of each 

 digit, except the outer side of the fifth, and communicate with 

 the dorsal branch of the ulnar ; the other, in passing to the back 

 of the fore-arm, gives a branch to the long and the short supinator 

 muscles ; it then divides to terminate in the extensor carpi radialis 



1 Vol. ii. p. 306, fig. 191, Hyana, i, which also serves to exemplify the homology 

 of the digits of the fore-paw in the Dog and Cat. 

 VOL. III. N 



