The lingual nerve is a branch of which division of the trigeminal nerve?

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The lingual nerve comes from the mandibular division of the trigeminal nerve. The trigeminal nerve splits into three divisions: ophthalmic, maxillary, and mandibular. The lingual nerve is a sensory branch of the mandibular division and provides sensation to the anterior two‑thirds of the tongue (with taste fibers carried to that region by the chorda tympani). There is no fourth division, so the mandibular division is the correct source.