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    trigeminal nerve

    The fifth cranial nerve. The trigeminal nerve has a large sensory root which is divided into three branches:
    • Ophthalmic. This conveys sensation from within the orbit other than sight, and sensation from the forehead and front of the scalp.


    • Maxillary. This conveys sensation from the upper jaw and teeth and overlying skin.


    • Mandibular. Ths convey sensation from the lower jaw and teeth and overlying skin, and ordinary sensation from the front of the tongue and mouth.
    The mandibular division enters a canal in the lower jaw. The ophthalmic division enters the back of the orbit. The maxillary division runs in a canal between the orbital floor and the roof of the maxilla to emerge on the front of the cheek.


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