The Lower Leg has an anterior compartment-the zone on the front of the shin. The “shin-bone” is technically known as the “tibia.” There is not much on the medial side (inside) of the tibia, but there are three muscles on its front – tibialis anterior, extensor hallucis longus, extensor digitorum longus. These muscles lift the ankle and toes (dorsiflexion).
Descending along the fibula (the lateral, lower leg bone)there are three muscles that cross the ankle
On the back of the lower leg, between the tibia and fibula, there are three muscles – peroneus longus, peroneus brevis and peroneus tertius. These muscles evert the foot (please don’t say pronate) We haven’t even mentioned the Achilles tendon yet!
The Achilles tendon is a confluence tendon for the two largest muscles of the calf – the gastrocnemius and soleus. The soleus only comes from the back of the tibia, and somewhat resembles a “sole fish,” (its namesake). The gastrocnemius crosses the back of the knee from its origin at the condyles of the femur, so it only hurts from spasm, usually, when the knee is straight. And, the soleus will hurt from spasm regardless of knee position, but both are prone to pain (when in spasm) if the ankle is doors-flexed.
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