MuscleForearm — anterior (intermediate)
Flexor digitorum superficialis
Latin: M. flexor digitorum superficialis
Location: Forearm
View the flexor digitorum superficialis in 3DOrigin
Humero-ulnar head: medial epicondyle and coronoid. Radial head: oblique line of the radius.
Insertion
Sides of the middle phalanges of the medial four fingers (each tendon splits for the profundus).
Action
Flexes the proximal interphalangeal joints, and secondarily the MCP and wrist — the typing muscle of the four fingers.
Nerve supply
Median nerve (C8–T1).
Blood supply
Ulnar and radial arteries.
Clinical relevance
Its tendons test finger-level flexion individually: 'flex the PIP while I hold the others'. Its fibrous sheath is where trigger fingers catch.
Educational anatomy reference, not medical advice. About this content.