Wikis > Anatomy > Muscles > Leg Muscles > Gastrocnemius

Proximal attachment – lateral surface of lateral condyle and posterior surface of medial condyle of femur
Distal attachment – posterior surface of calcaneus via achilles tendon (tendo calcaneus)
Open chain function – knee flexion and ankle plantarflexion
Closed chain function – maintains flexion tension on knee; prevents hyperextension of knee; decelerates internal rotation of the femur; flexes
knee to assist heel lift; assists in subtalar joint supination.
Nerve supply – tibial (S1, S2)
Arterial supply – sural artery

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