Cranial Nerve V
- The jaw reflex is a good indicator of increased tone.
- CNS lesions will likely involve all 3 divisions of CN V.
- PNS lesions can involve one or more of the branches.
- An upper motor neuron lesion (UMNL) will produce little dysfunction due to bilateral innervation to the muscles of mastication.
- A lower motor neuron lesion (LMNL) will result in paralysis and atrophy of the muscles of mastication.
Section: Cranial Nerve V
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