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It is the Trigeminal Nerve
The trigeminal nerve is CN V (cranial nerve V)
trigeminal neuralgia is inflamation of trigeminal ganglion & causes pain over distribution of trigeminal nerve
Cranial Nerve 5 (trigeminal), division V3 contains a buccal nerve, a lingual nerve and an inferior alveolar nerve.
The roman numeral "V" represents the trigeminal nerve.