SHORT MTSrLK- OF THE LITTLE FINGER. 79 



The ADDUCTOR OBLIQUCS POLLICIS (c') arises deeply in the hand Adductor 

 from the sheath of the flexor carpi radialis, the anterior ligaments bli q nns: 

 of the carpus, the os magnum, and the bases of the first, second, and origin ; 

 third metacarpal bones (fig. 32). Directed obliquely downwards and passes to 

 outwards, the greater part of the muscle is inserted into the ulnar side JJ^Sooid 

 of the base of the first phalanx in union with the adductor trans- bone, 

 versus, a sesamoid bone being formed in the tendon over the head 

 of the metacarpal bone. A small slip of the muscle usually passes and sends a 

 outwards beneath the tendon of the long flexor to join the insertion l^^al ; 

 of the outer head of the flexor brevis. 



The tendon of the flexor longus pollicis lies between this musale relations ; 

 and the flexor brevis ; and its origin is covered by the outer tendons 

 of the flexor profundus and the lunibricales. It lies over the 

 first dorsal interosseous muscle, and the ending of the radial 

 artery. 



Action. It flexes the metacarpo-phalangeal joint, and draws the use. 

 thumb over the palm. 



The ADDUCTOR TRANSVERSUS POLLICIS (D) is triangular in shape, Adductor 

 with the apex at the thumb, and the base in the centre of the palm. transversus 

 Its origin is from the ridge on the lower two-thirds of the palmar 

 aspect of the third metacarpal bone (fig. 32) ; and its insertion is into joins 

 the inner side of the first phalanx of the thumb, in common with the 

 last muscle. From the conjoined insertion of the two adductors a 

 slip is sent to the tendon of the extensor longus pollicis. 



The anterior surface is in contact with the tendons of the flexor relations 

 profundus and the lumbrical muscles ; and the posterior surface lies 

 :he interosseous muscles of the first and second spaces, with the 

 intervening metacarpal bone. The deep palmar arch separates this 

 muscle from the adductor obliquus. 



OH. It draws the thumb towards the centre of the palm. and use. 



SHORT MUSCLES OF THE LITTLE FINGER (fig. 31). In the Twoorthree 

 hypothenar eminence there are the abductor and opponens muscles 

 of the little finger, and sometimes a short flexor. 



The ABDUCTOR MINIMI DIGITI (E) is superficial to the opponens Abductor 

 muscle. It ari&s from the pisiform bone, and is inserted into the is beneath 

 ulnar side of the base of the first phalanx of the little finger ; an skin ' 

 oft'set from it reaches the extensor tendon on the back of the phalanx. 

 The paLmaris brevis partly conceals the muscle. 



Action. Firstly it draws the little finger away from the others ; use. 

 but continuing to act, it bends the metacarpo-phalangeal joint. 



The FLEXOK BREVIS MINIMI DIGITI (F) is placed at the radial Flexor 

 border of the preceding muscle. It takes origin from the tip 

 of the process of the unciform bone, and slightly from the 

 annular ligament ; and it is inserted with the abductor into the 

 first phalanx. 



It lies on the opponens ; and near its origin it is separated relations 

 from the abductor by the deep branches of the ulnar artery 

 and nerve. 



Action. It flexes and abducts the first phalanx of the little and use. 

 finger. 



