Flexor digitorum profundus III & IV
Innervation: Ulnar nerve
Function:
- Flexes the distal interphalangeal joint of fingers 4, 5.
- Assists in flexion of the proximal interphalangeal joint of fingers 4, 5.
- Assists in flexion of the metacarpophalangeal joint of fingers 4, 5.
- May weakly assist in flexion of the wrist.