Flexor Digitorum Profundus

Musculus flexor digitorum profundus

Upper Body ArmsForearms

Flexor digitorum profundus lies deep in the anterior forearm and is the only muscle able to flex the fingertip (distal interphalangeal) joints, making it the workhorse of crushing and hook grip. It is critical for heavy deadlifts, weighted hangs, and any maximal grip task. Its dual innervation (ulnar and median) reflects its split into medial and lateral functional halves.

Actions

Flexion of the distal interphalangeal joints of digits 2-5, Assists flexion of the proximal interphalangeal and metacarpophalangeal joints, Assists wrist flexion

Origin

Proximal three-quarters of the anterior and medial surfaces of the ulna and the adjacent interosseous membrane

Insertion

Palmar bases of the distal phalanges of the second to fifth digits

Innervation

Medial half (digits 4-5) by the ulnar nerve; lateral half (digits 2-3) by the anterior interosseous branch of the median nerve (C8, T1)

Blood supply

Ulnar artery, anterior interosseous artery

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