MUSCLES ON FRONT OF FOREARM. 



0,1 



Action. The pronator assists in bringing forwards the radius use on 

 over the ulna, so as to pronate the hand. When the radius is fixed, 

 the muscle raises that bone towards the humerus, bending the and elbow, 

 elbow -joint. 



The FLEXOR CARPI RADIALIS (fig. 24, 4 ) takes its origin from the Radial 

 common tendon, from the aponeurosis of the limb, and from the 

 mtermuscular septum on each side of it. The tendon of the muscle, 

 becoming free from fleshy fibres about the middle of the forearm, 

 - through a groove in the trapezium, in a special sheath at the 

 outer side of the anterior annular ligament, to be inserted mainly 



Triceps. 



Flexor carpi ulnaris. 



Flexor sublimis digitorum. 



Flexor longus pollicis. 



Brachialis anticus. 

 Pronator radii teres. 



. Biceps. 



Supinator brevis. 



Supinator longus. 



FIG. 25. THE RADIUS AXD ULNA FROM THE FRONT. 



into the base of the nietacarpal bone of the index finger, and by a 

 slip into that of the middle finger. 



The muscle rests chiefly on the flexor sublimis digitorum ; 

 near the wrist it lies over the flexor longus pollicis, a muscle of fi c j a i, 

 the deep group. As low as the middle of the forearm the flexor 

 carpi radialis corresponds externally with the pronator teres, and 

 below that with the radial artery, to which its tendon is taken as 

 the guide. The ulnar border is in contact at first with the palmaris 

 longus muscle, and for about two inches above the wrist with the artery, 

 median nerve. 



Action. The hand being free, the muscle first flexes the wrist- Use on wrist 

 joint, inclining the hand somewhat to the radial side ; and it will an 



