Flexor digitorum profundus originates in the upper 3/4 of the anterior and medial surfaces of the ulna, interosseous membrane and deep fascia of the forearm.

[3] Along with the flexor digitorum superficialis, it has long tendons that run down the arm and through the carpal tunnel and attach to the palmar side of the phalanges of the fingers.

[2] The lumbricals, intrinsic muscles of the hand, attach to the tendon of flexor digitorum profundus.

[citation needed] The tension generated by flexor digitorum profundus at the more distal joints is determined by wrist position.

The lack of differentiation in the FDP musculature in baboons makes it unlikely that this monkey can control individual fingers independently.