Gastrocnemius/Soleus

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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.


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