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NECK MUSCLE: Platysma
Origin: Fascia over pectoralis major and deltoid muscle
Insertion: Mandible, blends with muscles around the angle of the mouth, and skin of the lower face
Action: Draws outer part of lower lip inferiorly and posteriorly, depresses mandible
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MOUTH MUSCLE: Mentalis
Origin: Mandible
Insertion: Chin’s skin
Action: Elevates and protrudes lower lip and pulls skin of chin up
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MOUTH MUSCLE: 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, and shapes lips during speech
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EYEBROW MUSCLE: Corrugator supercilii
Origin: Medial end of superciliary arch of the frontal bone
Insertion: Eyebrow’s skin
Action: Draws eyebrow inferiorly and wrinkles skin of forehead vertically
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ORBIT MUSCLE: Orbicularis oculi
Origin: Medial wall of orbit
Insertion: Circular path around the orbit
Action: Closes eye
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SCALP MUSCLE: Frontal belly
Origin: Epicranial aponeurosis
Insertion: Skin superior to supraorbital margin
Action: Draws scalp anteriorly, raises eyebrows, and wrinkles skin of forehead horizontally
REFERENCE:
Tortora, G. J., & Derrickson, B. (2017). Principles of anatomy & physiology. Fifteenth edition; Wiley Loose-Leaf Print Companion. Hoboken, New Jersey, John Wiley & Sons, Inc.