Flexor digitorum superficialis muscle

Flexor digitorum superficialis
Gray421.png
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    anterior margins on the bases of the middle phalanges of the four fingers
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] It is relatively common for the Flexor digitorum superficialis to be missing from the little finger, bilaterally and unilaterally, which can cause problems when diagnosing a little finger injury. [4]

Contents

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. The ulnar collateral ligament of elbow joint gives its origin to part of this muscle.

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.

Function

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).

Additional images

References

External links


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • flexor digitorum superficialis muscle — musculus flexor digitorum superficialis …   Medical dictionary

  • humeroulnar head of flexor digitorum superficialis muscle — caput humero ulnare musculi flexoris digitorum superficialis …   Medical dictionary

  • radial head of flexor digitorum superficialis muscle — caput radiale musculi flexoris digitorum superficialis …   Medical dictionary

  • Flexor digitorum profundus muscle — Infobox Muscle Name = PAGENAME Latin = musculus flexor digitorum profundus GraySubject = 125 GrayPage = 448 Caption = Ventral view of the deep muscles of the forearm. FDP is shown in blue. Caption2 = Origin = ulna Insertion = distal phalanges… …   Wikipedia

  • flexor digitorum superficialis — flexor digitorum su·per·fi·ci·al·is .sü pər .fish ē ā ləs n a superficial muscle of the palmar side of the forearm that flexes esp. the second phalanges of the four fingers …   Medical dictionary

  • radial head of flexor digitorum sublimis muscle — caput radiale musculi flexoris digitorum superficialis …   Medical dictionary

  • musculus flexor digitorum superficialis — [TA] superficial flexor muscle of fingers (2 heads): origin, HUMEROULNAR HEAD—medial epicondyle of humerus, coronoid process of ulna, RADIAL HEAD—oblique line of radius, anterior border; insertion, sides of middle phalanges of four (nonthumb) …   Medical dictionary

  • Flexor pollicis longus muscle — Muscle infobox Name = Flexor pollicis longus muscle Latin = musculus flexor pollicis longus GraySubject = 125 GrayPage = 449 Caption = Front of the left forearm. Deep muscles. (Flexor pollicis longus is shown in blue) Caption2 = Origin = The… …   Wikipedia

  • Flexor carpi radialis muscle — Infobox Muscle Name = PAGENAME Latin = musculus flexor carpi radialis GraySubject = 125 GrayPage = 446 Caption = Front of the left forearm. Superficial muscles. (Flexor carpi radialis and its tendon visible in blue.) Caption2 = Front of right… …   Wikipedia

  • caput humeroulnare musculi flexoris digitorum superficialis — [TA] the humeroulnar head of the flexor digitorum superficialis muscle, arising from the medial epicondyle of the humerus and the coronoid process of the ulna …   Medical dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.