226 MYOLOGY. 



superior part of the trapezium, 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. Obliquus- Epicondylo-carpeus.} 



(FIG. 79. f.) 



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. 



O'i-igin. 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. 



Action. To assist the preceding muscle in flexing the carpus. 



FLEXOR METACARPI INTERNUS. 



(Epicondylo-metacarpeus. ) 



(Fie. 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 /oot ; 

 anteriorly with the radius ; posteriorly with the medius. 



Action. Like the preceding, to flex the carpus. 



