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Platysma
Origin: Fascia over deltoid and pectoralis major muscles
Insertion: Mandible
Action: Draws outer part of lower lip inferiorly and posteriorly as in pouting; depresses the mandible
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Depressor Labii Inferioris
Origin: Mandible
Insertion: Skin of lower lip
Action: Depresses lower lip
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Orbicularis oris
Origin: Muscle fibers surrounding the opening of the mouth
Insertion: Skin at the corner of the mouth
Action: Closes and protrudes lips, compresses lips against teeth; shapes lips during speech
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Corrugator Supercilii
Origin: Medial end of superciliary arch of frontal bone
Insertion: Skin of eyebrow
Action: Draws eyebrow inferiorly and wrinkles the skin of forehead vertically
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Orbicularis oculi
Origin: Medial wall of orbit
Insertion: Circular path around the orbit
Action: Closes eye
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Occipitofrontalis - Frontal belly
Origin: Epicranial aponeurosis
Insertion: Skin superior to supraorbital margin
Action: Draws scalp anteriorly, raises eyebrows, and wrinkles skin of forehead horizontally