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Platysma
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Origin: Fascia over deltoid and pectoralis major muscles
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Insertion: Mandible, blends with muscles around the angle of the mouth, and skin of the lower face.
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Action: Draws outer part of lower lip inferiorly and posteriorly as in pouting; depresses mandible.
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Mentalis
- Origin: Mandible
- Insertion: Skin of chin
- Action: Elevates and protrudes lower lip and pulls the skin of chin up
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Obicularis Oris
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Origin: Muscle fibers surrounding the opening of the mouth
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Insertion: Skin at the corner of the mouth
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Action: Closes and protrudes lips, as in kissing; compresses lips against teeth, and shapes lips during speech
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Corrugator Supercilii
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Origin: Medial end of superciliary arch of the frontal bone
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Insertion: Skin of the eyebrow
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Action: Draws eyebrow inferiorly and wrinkles skin of forehead vertically as in frowning
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Orbicularis oculi
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Origin: Medial wall of the orbit
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Insertion: Circular path around the orbit
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Action: Closes the eye
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Occipitofrontalis
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Origin: Epicranial aponeurosis
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Insertion: Skin superior to supraorbital margin
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Action: Draws scalp anteriorly, raises eyebrows, and wrinkles skin of forehead horizontally as in the look of surprise
Reference:
Principles of Anatomy & Physiology 14th Edition by Derrickson, B. and Tortora, G.