LKnative - Popliteal sciatic nerve block 
The green colour depicts the medial calcaneal nerve branch of the tibial nerve
7 – The medial calcaneal nerve branch of the tibial nerve
The medial calcaneal nerve is a branch of the tibial nerve
It arises postero-inferior to the medial malleolus
The medial calcaneal nerve branches innervates the skin of the heel