Synonyms: deep flexor of the fingers, perforating muscle
German: Musculus flexor digitorum profundus
The flexor digitorum profundus muscle belongs to the deep layer of the forearm flexors.
The origin of the muscle lies in the anterior surface of the ulna and in the palmar side of the interosseous membrane of the forearm.
The tendon of the muscle passes through the carpal tunnel below the flexor retinaculum. The distal phalanges of the IInd-Vth finger serve as insertion.
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The medianus nerve (anterior interosseus nerve) is responsible for the flexion of the 2nd and 3rd finger, and the ulnar nerve is responsible for the 4th and 5th finger flexion.
As the name suggests, this muscle is responsible for the palmar flexion of the proximal, medial and distal joints of the 2nd to 5th finger and of the wrist.
This muscle is the sole flexor of the distal joints of the 2nd-5th fingers. Its insertion tendons pass through the carpal tunnel and, in the tendon chiasma, through the tendons of the flexor digitorum superficialis muscle.