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Muscle: Platysma
Origin: Fascia over the pectoralis major and deltoid muscles
Insertion: Mandible
Action: Depression of lower lip and mandible; tension in the skin of the neck
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Muscle: Mentalis
Origin: Mandible
Insertion: Skin of the chin
Action: Elevation of the skin of the chin; protrusion and eversion of the lower lip
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Muscle: Orbicularis Oris
Origin: Muscle fibers surrounding mouth opening
Insertion: Skin at corner of the mouth
Action: Compression and protrusion of lips
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Muscle: Corrugator supercilii
Origin: Medial end of superciliary arch of frontal bone
Insertion: Skin of eyebrow
Action: Drawing of eyebrows inferiorly; wrinkling of the skin of the forehead vertically
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Muscle: Orbicularis oculi
Origin: Medial wall of orbit
Insertion: Circular path around the orbit
Action: Closing of the eye
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Muscle: Occipitofrontalis
Origin: Epicranial aponeurosis
Insertion: Skin superior to the supraorbital margin
Action: Lifting of the eyebrow and upper eyelid; wrinkling of the forehead skin horizontally; drawing of scalp anteriorly