The flexor digitorum profundus is a muscle of the arm of humans that flexes the fingers (also known as digits). It considers an external hand muscle that is running on the hand while the abdominal muscle place in the forearm. Together with the deep layer of ventral aqueduct muscles.  The muscle is called from the Latin, meaning “deep bender of the fingers.



flexor digitorum profundus functions

flexor digitorum profundus is a flexor of the wrist (mid carpal), metacarpophalangeal and interphalangeal joints. The lumbricals of hand, the essential muscles of the hand, attach to the tendon of the profundus bent digitorum. Therefore, flexural muscle use to assist lumbrical muscles in their function as extensors of interphalangeal joints.

As the lumbrical muscles emanating from the palm side of the hand and attach to the back aponeurosis. The force transfer from the flexor muscle to the fingers like as flex the metacarpophalangeal joints.


flexor digitorum profundus


The voltage generated by the profundus digitorum bent over the distal joints is more determined by the hand position. The flexibility of the wrist causes muscle contraction at this point, thus reducing the tension that can be produced distally. Fingers cannot be fully flexed if the wrist is completely flexible.



flexor digitorum profundus structure

Flexible profundus digitorum that originates from 3/4 top of the medial front surfaces of the beard, interosseous membrane and deep fascia of the forearm.  Along with the dendrobium bent the area, it has long tendons that run along the arm through the carpal tunnel and attach to the thin side of the changing of the fingers.


Flexible digitorum profundus lies deep on the superficial, but it distinguishes more distally. Therefore, the tendons of the profundus go through the tendons of the superficial and eventually attach the distal phalanx. This is a perforation muscle. The joints of the hand arise from the technical side of the tendons.



Supply of nerves

flexor digitorum profundus is a composite muscle innervate from nerve interosseous front nerves and ulnar. The medial aspect of the muscle (flexing the fourth and fifth digits)  which provide by the ulnar nerve (C8, T1).


The lateral aspect (which flexes the number 2 and 3) innervate from the median nerve especially the interosseous front branch (C8, T1).
This is one of the two flexor muscles that does not supply exclusively from the median.



 Case study flexor digitorum profundus

A 30-year-old male, right-handed, was referred to a hand clinic because of an injury to his left ring finger at the level of the distal phalangeal area. This injury had occurred several days before during a training session in his karate class. The patient did not experience any pain or notice the injury at the time of the training session.

Only later, in the locker room, did he feel pain at the level of the distal joint. At first, he was made to believe that it was a mild sprain and decided not to seek medical attention until two days after the injury when the pain and inflammation had not diminished.


In the evaluation, the patient experienced pain in the DIP joint of his left ring finger, which was neurovascularly intact. A painful eminence of the body was palpable on the volar side of the distal phalanx, and there was no active flexion of the DIP joint.


The radiographs revealed a comminuted fracture of the base of the distal phalanx, with the displacement of the volar fragment at the approximate level of the A4 pulley. The need for surgery, risks and complications and convalescence was discussed, and surgery was scheduled two days later.