"origin: lateral epicondyle of humerus, radial collateral ligament and posterior border of ulna"
"insertion: base of 5th metacarpal on posterior surface"
"innervation: posterior interosseous nerve (C7 and C8), a continuation of the deep branch of the radial nerve (C7, C8)"
"action: extension and adduction (i.e. ulnar deviation) of the wrist joint"
"origin: lateral epicondyle of humerus, radial collateral ligament and posterior border of ulna"
"insertion: base of 5th metacarpal on posterior surface"
"arterial supply: radial recurrent artery and posterior interosseous artery"
"innervation: posterior interosseous nerve (C7 and C8), a continuation of the deep branch of the radial nerve (C7, C8)"
"action: extension and adduction (i.e. ulnar deviation) of the wrist joint"