Foot nerves. Historical anatomical artwork of the nerves (white) of the sole of a human foot. Also shown are muscles (red), and ligaments, tendons and other connective tissues (grey). At left, the superficial muscles and tendons are seen, mostly covering the nerves. At right, the superficial tissues have been removed to show the branching of the internal and external plantar nerves. The heel bone (calcaneus, covered in connective tissue) is seen at top on each foot. Artwork from The Nerves of the Human Body (Ed. Jones Quain, London, 1839).