Plantaris Anatomy

Plantaris Muscle

Origin:  Lateral supracondylar ridge of the femur above the lateral head of the gastrocnemius
Insertion: Medial aspect of the posterior surface of the calcaneus, medial to the Achilles tendon.
Actions: Assists with flexion of the knee and plantarflexion of the foot at the ankle
Innervation: Tibial Nerve (S1, S2)
Blood Supply: Popliteal Artery

Primary Actions of the Plantaris Muscle

1. The plantaris muscle is not a prime mover and does not have a primary action

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Secondary Actions of the Plantaris Muscle

1. Assists with flexion of the knee
Agonists:

  • Biceps Femoris
  • Semitendinosus
  • Semimembranosus

Antagonists:

  • Vastus Lateralis
  • Vastus Medialis
  • Vastus Intermedius
  • Rectus Femoris

2. Assists with plantarflexion of the foot at the ankle

  Agonists:

  • Gastrocnemius
  • Soleus

  Antagonists: Tibialis Anterior