The pig's sensory papillae are tiny projections covering the surface of the tongue. The edges of the pig's tongue has more papillae than elsewhere. Some sensory papillae have taste buds.
There are four primary types of sensory papillae. The most common are thin, cover the entire surface of the tongue and do not contain taste buds. The mushroom-shaped papillae are primarily located on the top front end of the tongue and have taste buds in a cleft in the top of the papillae.The other types of sensory papillae have taste buds located along their sides. Taste buds can also be found on the roof of the pig's mouth.