MAMMALIA. 153 



to the ulnar side of the sublime and deep flexors, and the ulnar flexor ; near the hand 



it sends a branch to the back of this part to communicate with the radial branch of the 



spiral, and then proceed to the outer side of the last finger ; it passes deeply, confined 



by a ligament at its entrance into the palm, and sends a branch for the inner side of 



the last finger and the outer side of the third : 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 first and the inner side of the second finger, and the outer side of the 



second and the inner side of the third. The spiral nerve has a slight communication 



with the fifth cervical, but is principally formed from the sixth and seventh and first 



dorsal ; 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 large 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 hand and the side of each finger, 



except the outer side of the last, 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 ; it is conducted between some fibres of the short supinator, and then 



divides to terminate in the radial extensor of the wrist and the extensor of the fingers, 



whilst a long branch passes on and gives filaments to the muscles analogous to the 



extensors of the thumb, and to the wrist-joint, but does not terminate on this part in a 



ganglion, as in man and the baboon. 



The axillary plexus in the ass, also in the pig, is formed from the sixth and 

 seventh cervical nerves and the first dorsal. In the jaguar, the axillary plexus is 

 formed of the three inferior cervical and first dorsal nerves. In the ass, the superior 

 scapular nerve proceeds more particularly from the sixth, but in some degree from the 

 seventh, and is given to the superior and inferior spinous muscles of the scapula. 

 Branches proceeding from all the nerves forming the plexus are given to the great 

 pectoral muscle ; a nerve proceeding principally from the sixth and seventh cervical 

 nerves is given to the subscapular, the teres, and the broadest muscle of the back, and 



