Foot medial nerve regions. Artwork of the medial side of the foot, colour-coded by the areas supplied by the five nerves that can be blocked at the ankle with injections of local anaesthetic during surgery. These are the saphenous (brown), sural (not visible), posterior tibial (red), deep fibular (green), and superficial fibular (yellow). For artworks of the five nerve block injections into the ankle, see C016/6830 to C016/6834.