Circumvallate papillae - there are only about 10 to 14 of these papillae on most people, and they are present at the back of the oral part of the tongue.Innervated by facial nerve (anterior papillae) and glossopharyngeal nerve (posterior papillae). Foliate papillae - these are ridges and grooves towards the posterior part of the tongue found at the lateral borders.These are present mostly at the dorsal surface of the tongue, as well as at the sides. Fungiform papillae - as the name suggests, these are slightly mushroom-shaped if looked at in longitudinal section.There are four types of lingual papillae all except one contain taste buds:

The taste buds on the tongue sit on raised protrusions of the tongue surface called papillae. The average lifespan of these are estimated to be 10 days. On average, the human tongue has 2,000-8,000 taste buds. The taste receptor cells send information detected by clusters of various receptors and ion channels to the gustatory areas of the brain via the seventh, ninth and tenth cranial nerves. These are located on top of the taste receptor cells that constitute the taste buds. Via small openings in the tongue epithelium, called taste pores, parts of the food dissolved in saliva come into contact with the taste receptors. A popular myth assigns these different tastes to different regions of the tongue in fact, these tastes can be detected by any area of the tongue. These structures are involved in detecting the five elements of taste perception: saltiness, sourness, bitterness, sweetness and umami. The taste receptors are located around the small structures known as papillae found on the upper surface of the tongue, soft palate, upper esophagus, the cheek, and epiglottis. Taste buds contain the taste receptor cells, which are also known as gustatory cells.

Internal capsule drawit to know it