164 



PRACTICAL ANATOMY. 



Tlic adductor pollicis is the remaining muscle. It arises from the metacarpal 

 bone of the middle finger, the lower two-thirds. It is inserted into the base of 

 the first thumb phalanx on the inner side. (Fig. 1 14.) 



Xcrve-supply. The median nerve supplies the abductor pollicis, the opponens, 

 and the outer head of the flexor brevis pollicis. The ulnar nerve, by its deep 

 palmar branch, will supply all the remaining muscles of the hand, all the inter- 

 ossi-i muscles, the two ulnar lumbrical.s, the little finger group of small muscles, 

 the adductor pollicis, and the inner head of the flexor brevis pollicis. Now 

 trace out and review the branches of the median nerve to the thumb. 



The hypothenar muscles, or muscles of the little finger (Fig. 114): 



1. The abductor minimi digiti abducts the little finger. 



2. The flexor brevis minimi digit! bends the first phalanx. 



3. The opponens minimi digiti bends the metacarpal. 



FIG. 115. THE PALMAR INTEROSSEI. 



The abductor minimf digiti arises from the pisiform bone. (Fig. 109.) It is 

 inserted into the base of the first phalanx of the little finger. (Fig. 109.) Cut 

 and turn aside, and expose the two remaining muscles the flexor brevis minimi 

 digiti and the opponens minimi digiti. 



Note, as you turn this muscle aside, the abductor minimi digiti the deep 

 palmar nerve going to join the deep palmar arterial arch from the radial artery 

 (Fig. 1 1 6), whose course it will now follow. 



Tlic flexor brevis minimi digiti arises from the unciform process of the unci- 

 form bone and annular ligament. It is inserted into the base of the first phalanx 

 of the little finger. (Fig. 109.) 



Tlie opponens, minimi digiti arises from the unciform process of the unciform 

 bone and annular ligament. It is inserted into the whole length of the meta- 

 carpal bone of the little finger. Trace branches from the deep palmar branch of 

 the ulnar nerve to this group of muscles. (Fig. 1 1 1.) 



