A 35-year-old man with a trauma of his left hand was admitted to the traumatology department. Objectively: cut wound of palmar surface of left hand; middle phalanxes of II-V fingers don't bend. What muscles are damaged?

Answer options

1. Superficial finger flexor
2. Palmar interosseous muscles
3. Profound finger flexor
4. Dorsal interosseous muscles
5. Lumbrical muscles

Explanation

Flexor digitorum superficialis (superficial finger flexor) is an extrinsic flexor muscle of the fingers at the proximal interphalangeal joints. The primary function of flexor digitorum superficialis is flexion of the middle phalanges (II-V) of the fingers at the proximal interphalangeal joints, however, under continued action, it also flexes the metacarpophalangeal joints and wrist joint.