Soleus

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Other Names Calf Soleus Heads Soleus Movement Ankle Plantar Flexion Attachments Origin Tibia (Upper Posterior) Fibula (Upper Posterior) Insertion Calcaneous Achilles Tendon Related Muscles Gastrocnemius Comments In the seated calf raise (knees flexed approximately 90º), the gastrocnemius are virtually inactive while the load is borne almost entirely by the soleus. Also see dorsiflexion inflexibility. In moderate force, the soleus is preferentially activated in the concentric phase, whereas the gastrocnemius is preferentially activated in the eccentric phase (Nardone & Schiepatti, 1988).