Taste Bud

Taste buds contain the receptors for taste. They are located around the small structures on the upper surface of the tongue, soft palate, upper esophagus and epiglottis, which are called papillae. These structures are involved in detecting the five (known) elements of taste perception: salty, sour, bitter, sweet, and umami.
NYU virtual microscopy.  Tongue vallate papilla (link)

 

(image courtesy wikipedia)

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