Plantaris

Written by Roxanne Salkeld

Last updated January 16, 2023 • 6 Revisions

The plantaris is a small muscle within the superficial compartment of the posterior leg. It is absent in approximately 10% of the population.

  • Attachments: Originates from the lateral supracondylar line of the femur. The fibres condense into a tendon which travels down the leg, between the gastrocnemius and soleus muscles. It blends with the calcaneal tendon and inserts onto the calcaneus.
  • Actions: Contributes to plantarflexion at the ankle joint and flexion at the knee joint.
  • Innervation: Tibial nerve.
  • Blood supply: Lateral sural artery (branch of the popliteal artery).

    Fig 1
    The muscles in the superficial layer of the posterior leg. The body of the gastrocnemius has been cut away to expose the underlying musculature.

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