The document outlines the innervation of muscles of facial expression and mastication. It discusses that facial muscles are innervated by the facial nerve (CN VII) through its five terminal branches, while muscles of mastication are innervated by the mandibular nerve, a branch of the trigeminal nerve (CN V). It also reviews the cranial nerves, muscles of facial expression, branches of the facial and trigeminal nerves, and provides details on the innervation patterns of specific muscles.