Deep flexor of fingers

Deep flexor of fingers , m. Flexor digitorum profundus, is a strongly developed flat and broad abdomen, originating from the proximal half of the anterior surface of the ulnar body and the interosseous membrane of the forearm. The muscle goes down, passing into four long tendons, which, passing under the flexor retainer, lie in the carpal tunnel, located under the tendons of m. Flexoris digitorum superficialis. Then, each of the tendons m. Flexoris digitorum profundi passes between the legs of the tendon of the superficial flexor of the fingers, forming a cross of tendons, chiasma tendinum, and attached to the bases of the distal phalanges from the index finger to the little finger. Tendons of the superficial and deep flexor of the fingers lie in the common vagina of the flexors, vagina communis mm. Flexorum. The vagina of the index, middle and ring fingers begin at the level of the heads of metacarpal bones and reach the distal phalanges, not connecting with the common vagina. Only the vagina of the tendinus of the little finger is connected to the common vagina of the flexors.

Function: bends the distal phalanges of the fingers from the index finger to the little finger.

Innervation: nn. Ulnaris et medianus (CVI-ThI).

Blood supply: a. Ulnaris.