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Trigeminal Nerve in the Face - TOP: Sensory innervation of the orbit by the first division of the Trigeminal nerve (yellow) or opthalmic nerve, also showing the Gasserian ganglion of the Trigeminal nerve, the optic chiasm, and the beginnings of the other divisions of the Trigeminal nerve branching from the Gasserian ganglion. SECOND: Second division of the Trigeminal nerve, or maxillary nerve, showing course through the bony skull and innervation of the upper jaw. THIRD: Same, but showing the innervation of the nasal septum. FOURTH: Same, but showing innervation of the nasal cavity, also the olfactory nerve endings. FIFTH: Same, but showing more superficial layers of tissues. BOTTOM: The third division of the Trigeminal nerve or mandibular nerve also showing the small motor part of the Trigeminal nerve, or the masticator nerve.

The Trigeminal nerve is a large and complex nerve that is almost entirely sensory and reaches to almost all parts of the face. Anatomists divide its branches into three main Divisions, the first being the opthalmic nerve, the second being the maxillary nerve, and the third being the mandibular nerve. Each division has additional named branches. These three sensory nerves branch off from Gasserian ganglion. The Trigeminal nerve has a small motor part, the masticator muscle, which innervates muscles closely involved with mastication, such as the buccinator, masseter, and myohyoid.

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