According to this map, receptors at the tip of our tongues capture sweetness, bitterness is detected at the tongue's base, and along the sides, receptors capture salty and sour sensations.
He thinks this is all some game. Jon wanted to shake some sense into him. " Waggle your ears all you like. It's your tongue waggling that makes the trouble" .
Fossils of a 99-million-year-old toothed amphibian called Yaksha, shows a bone at the base of the tongue that can be activated by accelerator muscles to slingshot the tongue forward.