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Tongue anatomy. Historical anatomical artwork of a human tongue. The main diagram (centre) shows the upper surface of the tongue. The diagram below this one shows a dissection of the underside of the tongue to show the muscle structure. The top two diagrams show the superficial (left) and deep (right) layers of muscle looking from above. There are two cross-sections of the tongue: one near the back (centre left) and one near the front (centre right). The non-coloured drawings (lower left and lower right) show details of the tongue papillae (the structures of taste and feel). Artwork from The Nerves of the Human Body (Ed. Jones Quain, London, 1839). (KEYSTONE/SCIENCE PHOTO LIBRARY/SHEILA TERRY)