Dorsum of tongue showing location of papillae

Taste buds are located in elevations on the tongue called papillae.
3 types of papillae that contain taste buds: vallate papillae (about 12 that contain 100–300 taste buds)
Fungiform papillae (scattered over the tongue with about 5 taste buds each)
Foliate papillae (located in lateral trenches of the tongue—most of their taste buds degenerate in early childhood).

Filiform papillae cover the entire surface of the tongue.
Contain tactile receptors but no taste buds.
Increase friction to make it easier for the tongue to move food within the mouth.