If the motor branch of cranial nerve V is damaged, patients develop jaw deviation towards the side of the lesion due to the unopposed action of contralateral pterygoid muscles which are intact.
Unopposed force from the opposite pterygoid muscle results in jaw deviation to the side of the lesion.
It is important to note that the muscles of mastication will be paralyzed as well. Muscles in the head region that are paralyzed due to this lesion include medial pterygoid, lateral pterygoid, masseter and temporalis. The mandibular branch of the trigeminal nerve also supplies anterior belly of digastric, mylohyoid, tensor veli palatini and tensor tympani muscles.
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