Flexor digitorum superficialis is an extrinsic flexor muscle of the fingers. The bulk of the muscle is in the anterior of the forearm.
Like most flexors of the arm, it is supplied by the median nerve. Its blood comes from the ulnar artery. The proximal attachment includes the median epicondyle of the humerus as well as parts of the radius and ulna.
Four long tendons come off this muscle, and travel through the carpal tunnel. They then attach to the base of the proximal phlanges on the four fingers. These tendons have a split, or a hole, at the end of them through which the tendons of flexor digitorum profundus will travel.
Flexordigitorumsuperficialis (flexordigitorum sublimis) is an extrinsic flexormuscle of the fingers at the proximal interphalangeal joints.
The primary function of flexordigitorumsuperficialis is flexion of the middle phalanges of the fingers at the proximal interphalangeal joints, however under continued action it also flexes the metacarpophalangeal joints and wrist joint.
To test flexordigitorumsuperficialis, one finger is flexed at the proximal interphalangeal joint against resistance, while the remaining three fingers are held fully extended (to inactive flexordigitorum profundus).
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