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Flexor digitorum superficialis muscle: Wikis


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Flexor digitorum superficialis
Transverse section across distal ends of radius and ulna. (Flexor dig. subliminis labeled at center top.)
Latin musculus flexor digitorum superficialis
Gray's subject #125 448
Origin medial epicondyle of the humerus (common flexor tendon) as well as parts of the radius and ulna.
Insertion    phalanges
Artery ulnar artery
Nerve median nerve
Actions flexor of fingers (primarily at proximal interphalangeal joints)
Antagonist Extensor digitorum muscle

Flexor digitorum superficialis (flexor digitorum sublimis) is an extrinsic flexor muscle of the fingers at the proximal interphalangeal joints.

It is in the anterior compartment of the forearm. It is sometimes considered to be the deepest part of the superficial layer of this compartment,[1] [2] and sometimes considered to be a distinct, "intermediate layer" of this compartment.[3]


Origin and Insertion

The muscle has two classically described heads - the humeroulnar and radial - and it is between these heads that the median nerve and ulnar artery pass.

Four long tendons come off this muscle near the wrist and travel through the carpal tunnel formed by the flexor retinaculum. These tendons, along with those of flexor digitorum profundus, are enclosed by a common flexor sheath. The tendons attach to the anterior margins on the bases of the middle phalanges of the four fingers. These tendons have a split (Camper's Chiasm) at the end of them through which the tendons of flexor digitorum profundus pass.


The primary function of flexor digitorum superficialis is flexion of the middle phalanges of the fingers at the proximal interphalangeal joints, however under continued action it also flexes the metacarpophalangeal joints and wrist joint.

To test flexor digitorum superficialis, one finger is flexed at the proximal interphalangeal joint against resistance, while the remaining three fingers are held fully extended (to inactivate flexor digitorum profundus).

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