Explain How tongue can sense different tastes?

Our tongue can sense different tastes. Do you know which are the basic tastes and the areas where these are sensed? In humans, there are four basic tastes - sweet, sour, bitter and salt - as you may already know. Bitter substances are tasted on the back of the tongue, sour along the edges, sweet and salty tastes are appreciated mainly at the tip of the tongue. Sour and bitter substances are also tasted. on the palate along with some sensitivity to sweet and salt. All four modalities can also be sensed on the pharynx and epiglottis. Having studied about the structure, let us now look at the functions of the tongue.