Innervation and Embryological Origin
Unlike most of the other facial muscles, which are innervated by the facial nerve (or CN VII), the muscles of mastication are all innervated by the trigeminal nerve (or CN V). More specifically, they are innervated by the mandibular branch, or V3. This is a testament to their shared embryological origin from the first branchial arch.
The muscles of facial expression, on the other hand, derive from the second branchial arch.
Read more about this topic: Muscles Of Mastication
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