84 



THE MUSCLES. 



of the anterior hali: of the humeras as far as the extremity ; the 

 outer head arises from the outer surface of the humerus. Additional 

 fibi'es, which may be regarded as a fourth origin [m. snhmiconaeus), 

 arise from the upper surface of the hinder half of the humerus. 

 The fibres from these several origins xinite to form a strong muscle, 

 which covers the upper, inner^ and outer surfaces of the bone, and 

 then passes into a tendon. This tendon is attached to the capsule 

 of the elbow- joint and inserted into the proximal extremity of the 

 radio-ulnar. A cartilage, representing the olecranon, is found in the 

 cajDsule at the point of attachment of the tendon. 



B. Muscles of the Forearm. 

 (I.) Muscles of the flexor surface. 

 The muscles of this surface are arranged in two groups, so as to 

 form, at the elbow-joint, a triangular depression {plica cuhiti), into 

 which the tendon of the m. sternoradlalh sinks. 

 A. Muscles of the Inner Group. 



57. M. flexor carpi I -v. radiali-'^ i^^^- 



74 rr). 



Dugès, sous-hmnéro-carpien, n. 83. 



This represents either the flexor carpi 

 radialis Jongior or radiaUs brevior of man ; it 

 has a broad origin from the inner border of 

 the humerus above the epicondylus medialis. 

 It becomes narrower as it passes downwards 

 to be inserted by a tendon into the o-y 

 wmilunare and uaviciilare. The muscle is 

 much stronger in males than in females, 

 and the crest from which it takes origin is 

 correspondingly larger in the former sex 

 (p. 43). Tendinous fibres connect it with 

 the following miiscles : — 



Muscles of tlie right arm of 

 Raiia escule/ita. 



ed M. extens. digitoruni com- 

 munis. 



('« M. abductor digit! 1 1 longus. 



Ea' M. flexor antibrachil later- 

 alis superficialis. 



Fc M. flexor carpi radial. 



Ff' M. flexor carpi ulnar. 



Ed M. flexor digitorum com- 

 munis. 



■ir Tendon of tlie M. sterno- 

 radialis. 



58. M. flexor carpi Us. ulnar i.'i (Fig. 

 74 Fey 



Dugès, epitrochlo-carpien, n. 84. 

 This muscle represents the jiexor carpi 

 vhiaris or tdnaris anterior, and is close to 

 the inner side of the foreg-oing*. It arises 

 from the epicondylus medialis, being con- 

 nected by fibres with the flexor digitorum 

 cuuni/unls^ and is inserted into the os narlculare. 



