Median Nerve \ Quter head Qf flexQr 



360 APPLIED ANATOMY. 



the deep branch of the ulnar, which completes the formation of the deep arch. It 

 lies beneath the flexor tendons and on the interossei muscles and bases of the meta- 

 carpal bones (Fig. 373). 



Branches. The radial artery at the wrist gives off a posterior carpal branch 

 which anastomoses with the posterior carpal branch of the ulnar to form a posterior 

 carpal arch. From this arch descend three posterior interosseous arteries. The 

 dorsal interosseous artery lying to the radial side of the index finger is called the 

 dorsalis indicis. It comes off separately from the radial, and may be a branch from 

 the radialis indicis. 



As the radial artery, enters the palm it gives off a large branch to the 

 thumb called the princeps pollicis, and one to the palmar side of the index called 

 the radialis indicis. Farther on, three palmar interosseous branches are given off 

 which communicate at the webs of the fingers with the palmar digital arteries from 

 the superficial arch. The deep palmar arch also sends a few recurrent branches up 

 on the anterior surface of the carpus and three perforating branches between the 

 metacarpal bones to the back of the hand. 



NERVES OF THE HAND. 



The hand is supplied by the median, ulnar, and radial (musculospiral) nerves. 

 They are of clinical importance on account of the paralysis of the muscles or disturb- 

 ance of sensation which accompany their injury (Fig. 374). 



MUSCULAR BRANCHES. 



Abductor pollicis. 

 Opponens pollicis. 



I Outer head of flexor orevis. v0""-i&~' 

 [ First and second lumbricales. Tw < 



Ulnar Nerve To all the rest of the hand muscles. 



Superficial Branch Palmaris brevis. 



r Abductor minimi digiti. 

 Flexor brevis minimi digiti. 

 Opponens minimi digiti. 



Deep Branch \ Adductor transversus and obliquus pollicisfX. \tf\j.- 



| Inner head of flexor brevis pollicis. 

 | Two inner lumbricales. 

 I All the interossei. 



CUTANEOUS BRANCHES. 

 Palmar Surface. 



( Entire radial side of the palm over to the 



Median Nerve .1 middle of the ring finger and the groove 



at the wrist between the thenar and 

 hypothenar eminences. 

 Ulnar side of the little finger, and adjacent 

 sides of little and ring fingers and 



Ulnar Nerve \ hypothenar eminence. The adjacent 



branches of the ulnar and median 

 nerves anastomose. 



Dorsal Surface. 



C Ulnar side of thumb and matrix of nail. 



Median Nerve Distal half of the index and middle fin- 



| gers and distal half of the radial side of 

 the ring finger. 



] Both sides of the little finger and ulnar 



Ulnar Nerve < ., r . ,- 



I side of ring finger. 



( Both sides of thumb as far as the nail, 



I anastomosing with the median on the 

 ulnar side. Proximal half of the index 

 and, with the ulnar, the proximal half 

 of the middle and radial side of the ring 

 I finger. 



