Illustration of the upper surface of the tongue colour-coded according to innervation. At the front of the tongue (red) general sensory information is carried by the lingual nerve and taste information is carried by the facial nerve. At the back of the tongue (blue) all information is carried by the glossopharyngeal nerve. From Traite dAnatomie Humaine (1905) by French anatomist Leo Testut (1849-1925).