Know Everything About Flexor Digitorum Profundus & Flexor Digitorum Superficialis


Sometimes pull-ups can cause sudden unbearable pain, which might make you incapable of carrying out the further exercise. This may be the situation because of the flexor digitorum profundus and superficialis muscle; let understand about flexor digitorum profundus and flexor digitorum superficialis muscle. These muscles are very important to carry out the daily task productively. Today we are going to discuss these essential muscles of the forearm from the anterior compartment.

What is Flexor Digitorum Profundus?

It is a flat muscle of the forearm located at the deep layer and rooted to the superficialis. It helps to flex the fingers and often referred to as external hand muscle as it acts on hand, but its muscle belly lies in the forearm. 

Let’s talk about Flexor Digitorum Profundus Origin and Work

Flexor digitorum profundus(FDP), originates from the long bone of the forearm called ulna, more specifically from the front surface of the top part of its origin. Is it possible for you to sit still without moving or bending your fingers? Of course not, right. Finger flexion is required to grab anything with the help of fingers. Along with that, it helps the whole hand in bending the wrist and other movements.    

 flexor digitorum profundus and superficialis


What is Flexor Digitorum Superficialis?

Also known as flexor digitorum sublimis, it is an external flexor muscle located at the proximal interphalangeal joints. Sometimes it is considered as deepest part and sometimes as an intermediate layer of the superficial layer. 

Let’s talk about Flexor Digitorum Superficialis Origin and Work

Flexor digitorum superficialis(FDS) has two heads i.e., radial head and humero-ulnar head. The latter is a part of the ulna. Radial heads got its name from the radius, which is another bone of the forearm. The prime function of FDS is to provide flexion of the middle phalanges of the four fingers except for the thumb. It also flexes metacarpophalangeal joints and wrist joints. 

 flexor digitorum profundus and superficialis


Understand these Two Together

FDS and FDP run along with the tendon sheath into the canal. The canal is formed with the help of phalanges, pulley system, and tendon sheath. Pulley system plays a role in keeping the flexon tendons together with the bones and convert the linear force into torque and rotation of the fingers joints. 

Injuries to the Flexor Tendons

The medical field has classified into five zones; the first zone is also referred to as a jersey finger where profundus muscles tore away. Zone II FDS and FDP injured together and other zones related to other muscles of forearms.

Also Read: What is Unipolar Depression and What are its Treatment

Clinical Evidence

These injuries cannot be diagnosed with an X-ray due to limitation lateral and AP views. MRI can be a better option to find out soft tissue injuries. 


 flexor digitorum profundus


All the flexor tendons should be referred to the specialist of hand disorders for the best result and functional outcomes. The surgery treatment option depends on the condition and surrounding tissues of the flexor digitorum profundus and Flexor digitorum superficialis. 


Flexor digitorum profundus and Flexor digitorum superficialis are important muscles of the forearm. Gripping things and moving hands won’t be possible with the FDS and FDP. For all health information, keep reading HealthClubFinder.