THE FOREARM/ 



309 



Both the flexor carpi radialis and the flexor carpi ulnaris flex the hand at the 

 wrist. When the ulnaris alone acts it tends to tilt the hand inward; when the 

 radialis acts alone it tends to incline the hand outward. Being superficial, these 

 muscles are both important landmarks and guides to the arteries. 



Pisiform bone 



FIG. 324. The flexor muscles of the wrist. 



FIG. 325. The extensor muscles of the \vriyt. 



EXTENSORS OF THE WRIST. 



Extensor Carpi Radialis Longior. The extensor carpi radialis longior 

 arises from the lower third of the external supracondylar ridge and the lateral 

 (external) condyle and inserts into the back of the base of the second metacarpal 

 bone. When it contracts it tends to tilt the hand toward the radial side as well 



