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Best Answer: There are three cranial nerve involved in taste... The Facial Nerve carries information from the front 2/3 of the tongue. (Cranial Nerve VII) The Glossopharyngeal Nerve carries information from the back 1/3 of the tongure (Cranial Nerve IX) The Vagus Nerve also carries some taste information, but it's a minor component (Cranial Nerve X).
Both the glossopharyngeal and vagus nerves (CN IX and X) have taste and somatic sensory functions that are not routinely examined. However, the taste function in the glossopharyngeal nerve (CN IX) can be examined if there is suspicion of damage to the nerve (vagus nerve taste function cannot be tested).