Gastrocnemius “Gastrocs”

Joe Muscolino

Share This

The gastrocnemius ("gastrocs") of the superficial posterior compartment of the (lower) leg. The gastrocnemius has two heads: medial head and lateral head.

The Gastrocnemius is located in the Superficial Posterior Compartment of the (lower) leg. The muscles in the superficial posterior compartment are:

The Gastrocnemius has two heads: Lateral head and Medial head.


  • Medial and lateral femoral condyles to the calcaneus via the Achilles/calcaneal tendon.



  • Plantarflexes the foot at the ankle joint.
  • Flexes the leg at the knee joint.
  • Inverts (Supinates) the foot at the subtalar joint.



  1. The two heads of the gastrocnemius are two of the three heads (along with the soleus) of the Triceps Surae Group.
  2. Inversion is the principal cardinal-plane (frontal-plane) component of the oblique-plane motion pattern of supination.