Each of the fifth and largest pair of cranial nerves, supplying the front part of the head and dividing into the ophthalmic, maxillary, and mandibular nerves.
- The most frequently involved cranial nerve dermatome is the ophthalmic division of the trigeminal nerve.
- The circuit for this reflex comprises the trigeminal nerve, pons crossover, and motor innervation via the facial nerve.
- There is contiguous spread to the ipsilateral ACA and MCA via a perivascular plexus supplied by the ophthalmic division of the trigeminal nerve.
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