Gastrocnemius/Soleus
Gastrocnemius
Because the muscle has two muscle actions, it acts upon the knee and the ankle separately, not simultaneously. "Extension" when referred to during triple extension of the hip, knee and ankle. Crosses two joints.
Gastrocnemius Insertion
Calcaneus via the Achilles Tendon
Soleus Insertion
Calcaneus via the achilles tendon
Soleus
Deep to the gastrocnemius Stronger plantar flexion of the two Highly emphasized while performing plantar flexion while the knee is flexed.
Gastrocnemius Origin
Medial head - medial epicondyle of the femur Lateral head - lateral epicondyle of the femur
Gastrocnemius Actions
Plantar flexion of the ankle Assists in flexion of the knee
Soleus Actions
Plantar flexion of the ankle.
Soleus Origin
Soleal line of the tibia tendon. Posterior head and upper shaft of the fibula.