Flexor digitorum profundus muscle
The flexor digitorum profundus affects different parts of the hand depending on the degree of its contraction. If contracted weakly, it flexes only the distal interphalangeal joints. Stronger contraction will also flex the proximal interphalangeal and metacarpophalangeal joints and the wrist.
The flexor digitorum profundus is innervated by the median nerve and the ulnar nerve.