FLEXOR DIGITORUM PROFUNDUS

ORIGIN
Medial olecranon, upper three quarters of anterior and medial surface of ulna as far round as subcutaneous border and narrow strip of interosseous membrane
INSERTION
Distal phalanges of medial four fingers. Tendon to index finger separates early
ACTION
Flexes distal interphalangeal joints, then secondarily flexes proximal interphalangeal and metacarpophalangeal joints and wrist
NERVE
Median nerve (anterior interosseous) and ulnar nerve