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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