Gastrocnemius

Origin Medial head from posterior nonarticular surface of medial femoral condyle; Lateral head from lateral surface of femoral lateral condyle
Insertion The two heads unite into a broad aponeurosis which eventually unites with the deep tendon of the soleus to form the Achilles tendon, inserting on the middle 1/3 of the posterior calcaneal surface
Action Powerful plantar flexor of ankle
Innervation Tibial nerve (S1, S2) (S1, S2)
Arterial Supply Each head supplied by a sural branch of the popliteal artery

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Muscle Atlas of the Extremities