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Flexor digitorum superficialis

The flexor digitorum superficialis (or flexor digitorum superficialis muscle, latin: musculus flexor digitorum superficialis) is a flat muscle of the forearm that belongs to the anterior muscle group and is situated in the second layer, in the deepest part of the superficial layer.

Origin

The flexor digitorum superficialis originates from the medial epicondyle of the humerus.

Insertion

The flexor digitorum superficialis passes vertically downwards, through the carpal tunnel (or carpal channel). Further, it splits into four tendons that insert at the bases of the intermediate phalanges of the second to fifth digits.

Action

The main function of the flexor digitorum superficialis is flexion of the hand and phalanges.

Innervation

The flexor digitorum superficialis is innervated by the median nerve.