TAS1R2 + 3 expressing cells are found in circumvallate papillae and foliate papillae near the back of the tongue and palate taste receptor cells in the roof of the mouth.Fungiform papillae are present on the anterior portion of the tongue while circumvallate papillae and foliate papillae are found on the posterior portion of the tongue.A defensive ring of forts outside the ring of circumvallated forts, called contravallation, is also sometimes used to defend the attackers from outside.When she puts sweet onto the circumvallates, she's testing the taste nerve at the tongue's back : the glossopharyngeal.These are the : circumvallate papillae ( vallate papillae ), fungiform papillae, filiform papillae and foliate papillae.These glands empty their serous secretion into the base of the moats around the foliate and circumvallate papillae.The glossopharyngeal nerve innervates a third of the tongue including the circumvallate papillae. ![]()
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