MuscleForearm — posterior (deep)
Supinator
Latin: M. supinator
Location: Forearm
View the supinator in 3DOrigin
Lateral epicondyle, radial collateral and annular ligaments, supinator crest of the ulna.
Insertion
Lateral, posterior and anterior surfaces of the proximal radial shaft.
Action
Supinates the forearm — 'can I carry a bowl of soup?' — with the biceps adding power in flexion.
Nerve supply
Posterior interosseous nerve (C6–C8).
Blood supply
Radial recurrent artery.
Clinical relevance
The posterior interosseous nerve threads it in the arcade of Frohse — compression here mimics radial palsy with finger-drop but no wrist-drop.
Educational anatomy reference, not medical advice. About this content.