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Platysma
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Origin: Fascia over deltoid and pectoralis major muscles
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Insertion: Mandible
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Action: Lowers the inferior lips; depresses and wrinkles skin of lower face and mouth; depresses mandible
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Mentalis
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Origin: Incisive fossa on anterior aspect of mandible
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Insertion: Skin of chin
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Action: Elevates and wrinkles skin of chin and protrudes lower lip
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Orbicularis oris
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Origin: Near midline on anterior surface of maxilla and mandible and modiolus at angle of mouth
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Insertion: Skin at corner of mouth
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Action: Narrows orifice of mouth, purses lips and puckers lip edges
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Corrugator supercilii
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Origin: Medial superciliary arch
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Insertion: Skin of medial forehead
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Action: Wrinkles forehead
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Orbicularis oculi
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Origin: Medial wall of orbit
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Insertion: Circular path around orbit, Lateral palpebral raphe
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Action: Closes eyelids, aids passage and drainage of tears
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Occipitofrontalis
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Origin: Occipital belly: supreme nuchal line of the occipital bone; Frontal belly: epicranial aponeurosis
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Insertion: Occipital belly: epicranial aponeurosis; Frontal belly: skin of eyebrows and root of nose.
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Action: Occipital belly: draws scalp backwards; Frontal belly: raises eyebrows and wrinkles forehead.
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