Lisa Emeri C. Tena
2024-06557
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Muscle: Platysma
Origin: Fascia over deltoid and pectoralis major muscles
Insertion: Mandible
Action: Draws outer part of lower lip inferiorly and posteriorly (e.g. pouting) and depresses mandible
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Muscle: Depressor labii inferioris
Origin: Mandible
Insertion: Skin of lower lip
Action: Lowers/depresses lower lip
3. Muscle: Orbicularis oris
Origin: Muscle fibers surrounding opening of mouth
Insertion: Skin at corner of mouth
Action: Closes and protrudes lips (e.g. kissing), compresses lips against teeth, and shapes lips during speech
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Muscle: Corrugator supercilii
Origin: Medial end of superciliary arch of frontal bone
Insertion: Skin of eyebrow
Action: Draws eyebrow inferiorly and wrinkles skin of forehead vertically just like in frowning
5. Muscle: Orbicularis oculi
Origin: Medial wall of orbit
Insertion: Circular path around orbit
Action: Closes eye
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Muscle: Frontal Belly (Occipitofrontalis)
Origin: Epicranial aponeurosis
Insertion: Skin superior to supraorbital margin
Action: Draws scalp anteriorly, raises eyebrows, and wrinkles skin of forehead horizontally as in look of surprise