Name: Nicole Placido 09/08/23
Anatomy and Physiology Ma’am Josephine Aldaba
ACTIVITY # 1
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Muscle: Platysma
Origin: Subcutaneous tissue of infraclavicular regions
Insertion: Base of mandible, skin of cheeks, and lower lip ; angle of mouth (modiolus); orbicularis oris
Action: Tenses skin of inferior face and neck (conveying tension a stress); depresses mandible (against resistance)
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Muscle: Mentalis
Origin: Body of mandible (anterior to roots of inferior incisors)
Interior: Skin of chin (mentolabial sulcus)
Action: Elevates and protrudes lower lip and pulls skin of chin, as in pouting.
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Muscle: Orbicularis oris
Origin: Medial maxilla and mandible; deep surface of perioral skin; angle of mouth
Interior: Mucous membrane at lIps
Action: Tonus closes oral fissure; phasic contraction compresses a protrudes lips
or resists distension
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Muscle: Corrugator Supercili
Origin: Medial end of superciliary arch of frontal bone.
Insertion: Skin of eyebrow
Action: Draws eyebrow inferiorly & wrinkles skin of forehead vertically as in frowning.
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Muscle: Orbicularis oculi
Origin: Medial wall of orbit
Insertion: Circular path around orbit
Action: Closes eye
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Muscle: 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.
REFERENCE:
Tortora, G.J. and Derrickson, B. (2017) Principles of anatomy and physiology. Danvers, MA: Wiley Custom Learning Solutions.