226 MYOLOGY. 



superior jiart of the trapeziuiifi, blending with the flexor meta- 

 carpi medius. 



Relation. — Externally with the fascia ; internally with the 

 flexor pedis muscles and the flexor medius ; anteriorly with the 

 extensor suffraginis. 



Action. — To flex the carpus. 



FLEXOR METACARPI MEDIUS. 



{Flexor M. Ohliquus — Ejncondijlo-caiyeus.) 



(Fig. 79./.) 



Similar in structure to the preceding muscle, it is situated on 

 the postero-internal part of the radius, extending downwards and 

 outwards. It is long, flat, and bifid above ; one head is small, 

 the other large and fleshy. 



Origin. — The large head arises from the epicondyle, the small 

 head from the posterior surface of the olecranon ; they unite at a 

 short distance down the radius. 



Insertion. — By one tendon to the supero-posterior and inter- 

 nal part of the trapezium, blending with the externus. 



Relation. — Externally with the fascia ; internally with the 

 flexors of the foot ; anteriorly with the flexor internus ; posteriorly 

 with the flexor externus. 



Actio7i. — To assist the preceding muscle in flexing the carpus. 



FLEXOR METACARPI INTERNUS. 



{Epicondylo-inetacar2)eus.) 



(Fig. 79. e.) 



Situated on the internal aspect of the fore-arm, it resembles 

 the two preceding muscles in its structure, being long and 

 flattened, with a fleshy belly, but having a long tendon of 

 insertion. 



Origin. — By tendinous fibres from the base of the epicondyle 

 just by the medius. 



Insertion.-. — To the head of the inner splint bone, the long 

 round tendon passing through a synovial theca on the inner side 

 of the carpus. 



Relation. — Externally with the fascia ; internally with the 

 chief radial vessels and nerves, and the flexors of the foot ; 

 anteriorly with the radius ; posteriorly with the medius. 



Action. — Like the preceding, to flex the carpus. 



