Flexor digitorum profundus

  • The flexor digitorum profundus (or flexor digitorum profundus muscle, latin: musculus flexor digitorum profundus) is a flat muscle of the forearm that belongs to the anterior muscle group and is situated in the third or deep layer.

    The flexor digitorum profundus lies directly beneath the flexor digitorum superficialis. The flexor digitorum profundus originates from the anterior surface of the ulna and from the interosseous membrane. The muscle descends almost vertically, passes through the carpal tunnel. Further, the flexor digitorum profundus splits into four tendons that insert at the bases of the distal phalanges of four digits, namely, the second to fifth digits (II-V) of the hand.

    The flexor digitorum profundus provides flexion of all phalanges of the four digits and flexion of the hand.