SHOULDER, ARM. FOREARM, II I Mi. POSTERIOR PART. 349 



Trace to their origins the radial group of muscles : 



I. Supinator longus, to upper two-thirds of external condylar ridge of the 

 hunierus. (Fig. - 



Extensor carpi radialla louglor 



Tru-eps 



Flexor carpi ulnaria 



Extcnaor carpi ulnaria 



Extenaor minimi digit! 



ULNA 



!'!(;. 243. MUSCLES OF THE RADIAL SIDE AND THE BACK OF THE FOREARM. 



2. Kxtensor carpi radialis longior, trace to the lower one-third of external 

 condylar ridge of the humerus. 



3. Kxtensor carpi radialis brevior, to the outer condyle of the humerus. 



To do this properly, begin with the tendon and follow it upward, dividing the 



