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gastrocnemius gas·troc·ne·mi·us (gās'trŏk-nē'mē-əs, gās'trə-)
n. pl. gas·troc·ne·mi·i (-mē-ī')
A muscle with its origin from the lateral and medial condyles of the femur, with insertion with the soleus muscle by the Achilles tendon into the lower half of the posterior surface of the calcaneus, with nerve supply from the tibial nerve, and whose action causes plantar flexion of the foot.