SUPINATOR

ORIGIN
Deep part (horizontal):supinator crest and fossa of ulna. Superficial part (downwards): lateral epicondyle and lateral ligament of elbow and annular ligament
INSERTION
Neck and shaft of radius, between anterior and posterior oblique lines
ACTION
Supinates forearm. Only acts alone when elbow extended
NERVE
Posterior interosseous nerve (C5, 6)