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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 angle of mouth, and skin of lower face
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Action: Draws outer part of lips inferiorly and posteriorly, depresses mandible
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Mentalis
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Origin: Mandible
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Insertion: Skin of chin
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Action: Elevates and protrudes lower lip and pulls skin of chin up
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Buccinator
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Origin: Alveolar processes of maxilla and mandible and pterygomandibular raphe
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Insertion: Orbicularis oris
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Action: Presses cheeks against teeth and lips, draws corners of the mouth laterally, and assists in mastication
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Corrugator supercilii
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Origin: Medial and superciliary arch of frontal bone
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Insertion: Skin of eyebrow
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Action: Draws eyebrow inferiorly and wrinkles skin of forehead vertically
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Orbicularis oculi
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Origin: Medial wall of orbit
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Insertion: Circular path around orbit
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Action: Closes eye
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Occipitofrontalis (Frontal belly)
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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
Reference used:
Tortora, G. J., & Derrickson, B. H. (2017). Principles of Anatomy and Physiology (15th ed.). Wiley. Retrieved from https://handoutset.com/wp-content/uploads/2022/05/Principles-of-anatomy-and-physiology-Wiley-2017-Derrickson-Bryan-H._-Tortora-Gerard-J..pdf.