LKnative - Popliteal sciatic nerve block 
The green colour depicts the cutaneous distribution of the lateral cutaneous nerve of the calf
17 – Lateral cutaneous nerve of the calf
The lateral cutaneous nerve of calf (also known as the lateral sural nerve) is a cutaneous branch of the common fibular nerve
It arises near the neck of the fibula and supplies skin over the lateral aspect of the leg just distal to the knee