The following is a rough guide to the areas each branch innervates. Note that there is some “cross-talk,” or overlap of the circuitry, between branches.
Frontal (temporal): The muscles of the forehead
Zygomatic: The muscles involved in forceful eye closure
Buccal: The muscles involved in moving the nostril, upper lip, spontaneous eye blinking, and raising the corner of the mouth to smile.
Marginal mandibular branch: The muscles involved in depressing the lower lipCervical: lower chin muscle (platysma), often tensed during facial hair shaving. It also lowers the corner of the mouth
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