156 HUMAN ANATOMY. 



ADDUCTOR POLLICIS (ADDUCTOR TRANSVERSUS POLLICIS). 

 Origin, from lower two-thirds palmar surface of middle meta- 

 carpal bone; insertion, into nlnar side of base of first thumb 

 phalanx and internal sesamoid bone; action/ adducts thumb; 

 nerve, ulnar. 



Ulnar Region. 



PALMARIS BREVIS. Origin, from palmar fascia and annu- 

 lar ligament; insertion, into skin of palm of hand; action, 

 wrinkles skin of hand; nerve, ulnar. 



ABDUCTOR MINIMI DIGITI. Origin, from pisiform bone 

 and from tendon of flexor carpi ulnaris; insertion, into base of 

 first phalanx of little finger on its ulnar side; action, abducts 

 little finger from median line; nerve, ulnar. 



FLEXOR BREVIS MINIMI DIGITI. Origin, from annular 

 ligament and tip of unciform process of uniform bone; inser- 

 tion, into the first phalanx of little finger; action, flexes little 

 finger; nerve, ulnar. 



OPPONENS MINIMI DIGITI. Origin, from annular ligament 

 and from unciform process 'of unciform bone; insertion, into 

 ulnar border of whole length of metacarpal bone of little finger ; 

 action, flexes little finger; nerve, ulnar. 



Palmar Region. 



LUMBRICALES. Origin, by four fleshy tendons from the 

 tendons of the deep flexors the first and second from the palmar 

 surface and radial side of the tendons of the index and middle 

 fingers, the third from the adjoining sides of the tendons of the 

 middle and ring fingers, and the fourth from the adjoining sides 

 of the tendons of the ring and little fingers ; insertion, on dorsal 

 aspect of each finger into the expansion of the extensor communis 

 digitorum ; action, abduct the fingers to either side of the median 

 line; nerves, ulnar and median. 



INTEROSSEI MUSCLES consist of two groups, the dorsal and 

 palmar. 



DORSAL INTEROSSEI. Origin, from two heads from the 

 adjacent sides of the metacarpal bones, four in number; inser- 

 tion, the first into the radial side of the base of the first phalanx 

 of the index finger, the second into the radial side of the middle 

 finger, the third into the ulnar side of the middle finger, and the 

 fourth into the ulnar side of the ring finger, the middle finger 

 having two, one on either side; action, abduct the fingers from 

 the median line; nerve, ulnar. 



