The proper mechanics of position of the thumb are crippled. Functional Anatomy The thumb is controlled by 4 long and 6 short muscles arranged about its circumference and supplied by the radial ...

wkes.eu The extensor carpi ulnaris ... ECU is a long thin muscle located on the ulnar aspect of the forearm. It arises from the lateral epicondyle of the distal humerus and inserts at the fifth ...