## Sensory Distribution of Trigeminal Nerve Divisions **Key Point:** The trigeminal nerve provides sensory innervation to the face in three distinct, non-overlapping territories: | Division | Primary Sensory Territory | |----------|---------------------------| | V1 (Ophthalmic) | Forehead, upper eyelid, cornea, nasal dorsum, anterior scalp | | V2 (Maxillary) | Upper lip, upper teeth, hard palate, cheek, lateral nasal wall, upper gingiva | | V3 (Mandibular) | Lower lip, lower teeth, anterior 2/3 tongue, lower gingiva, chin, temporal region | **High-Yield:** The maxillary division (V2) is the only division that innervates the hard palate — this is a frequently tested fact. The soft palate is innervated by the glossopharyngeal nerve (CN IX). **Mnemonic:** **V1-Forehead, V2-Upper lip, V3-Lower lip** — think of the divisions as horizontal bands across the face. **Clinical Pearl:** The temporal region receives sensory innervation from the auriculotemporal branch of V3 (mandibular division), not from V1. Trigeminal neuralgia affecting V3 often presents with pain in the temporal and lower jaw regions. 
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