The Flexor Digitorum Profundus: Anatomy, Function, and Innervation in Finger Flexion

Muscle of the forearm that flexes under the ulna bone.

The muscle of the forearm that flexes under the ulna bone is called the flexor digitorum profundus

The muscle of the forearm that flexes under the ulna bone is called the flexor digitorum profundus.

The flexor digitorum profundus is one of the forearm muscles that is located on the anterior side (front) of the forearm. It runs from the inner side of the elbow joint, known as the medial epicondyle of the humerus, and attaches to the distal phalanges (bones) of the fingers.

As the name suggests, the flexor digitorum profundus is responsible for flexing the fingers, specifically the second to fifth fingers. It works by contracting and pulling on the tendons that pass through the carpal tunnel and attach to the finger bones.

The flexor digitorum profundus is innervated by the ulnar nerve, which is one of the major nerves of the arm. This nerve provides the necessary electrical stimulus for the muscle to contract and facilitate finger flexion.

Additionally, it is important to note that the flexor digitorum profundus lies deeper in the forearm compared to another muscle called the flexor digitorum superficialis, which is located superficially and is responsible for flexion at the proximal interphalangeal joints.

In summary, the flexor digitorum profundus is the muscle in the forearm that flexes under the ulna bone. It contributes to finger flexion and is innervated by the ulnar nerve.

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