Flexor digitorum superficialis

Andrew Murphy and Dr Henry Knipe et al.

Flexor digitorum superficialis (FDS), also known as flexor digitorum sublimis, is a muscle in the second (intermediate) layer of the anterior compartment of the forearm. It splits into four tendons, passes through the carpal tunnel under the flexor retinaculum. At the level of the head of the metacarpal, the FDS tendons split and wrap around the flexor digitorum profundus creating an aperture for the flexor digitorum profundus to travel through. The FDS tendons rejoin deep to the flexor digitorum profundus and insert at the volar side of the proximal portion of the middle phalanx of the 2nd- 5th digits. It is one of the extrinsic muscles of the hand.


Anatomy: Upper limb

Anatomy: Upper limb

Article information

rID: 23258
Section: Anatomy
Synonyms or Alternate Spellings:
  • Flexor digitorum sublimis
  • FDS
  • Flexor digitorum superficialis muscle

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Cases and figures

  • Figure 1: carpal tunnel diagram
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