Name Flexor digitorum profundusPronunciation (FLEK-sur dij-i-TOR-um pro-FUN-dus) Origin/Proximal Attachment Anterior & medial surface of proximal 3/4 ulna; adjacent interosseous membrane Insertion/Distal Attachment Distal phalanx of the 4 fingers (through Flexor digitorum superficialis tunnel) Action/Relevance Flexes the distal IP joints, & thus the proximal & middle IP jointsFlexes the wrist if fingers are extended Innervation Medial portion: ulnar nerve (C8, T1) Lateral portion: interosseous branch of median nerve (C8, T1) | 
