Palmaris longus

Dr Daniel J Bell and Dr Henry Knipe et al.

Palmaris longus (PL) is a superficial, weak flexor of the wrist located in the anterior compartment of the forearm. It is one of the extrinsic muscles of the hand.

Palmaris longus is often absent, more commonly unilaterally absent than bilaterally. There is ethnic variation in prevalence of absence:

  • in ~3% of Asians
  • in ~5% of African-Americans
  • in ~14 (range 12-16%) of whites (Caucasians/Hispanics)

Due to its long tendon and short muscle belly, palmaris longus is often used as a donor tendon and its absence is not associated with any functional deficit 2.

Anatomy: Upper limb
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Article information

rID: 23240
Section: Anatomy
Synonyms or Alternate Spellings:
  • Palmaris longus muscle
  • Palmaris longus (PL)

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