Activity 4
5 muscles which are affected and its actions:
1. Orbicularis Oris
Action: Closes and protrudes lips, as in kissing; compresses lips against teeth; and shapes lips during speech.
2. Platysma Muscle
Action: Draws outer part of lower lip inferiorly and posteriorly as in pouting; depresses mandible.
3. Buccinator
Action: Presses cheeks against teeth and lips, as in whistling, blowing, and sucking; draws corner of mouth laterally.
4. Occipitofrontalis
Action: Draws scalp anteriorly, raises eyebrows, and wrinkles skin of forehead
5. Orbicularis oculi
Action: Closes eye
Mechanism of his muscle weakness:
It is due to damage or disease of the facial (VII) nerve. Facial paralysis can be caused by inflammation of the facial nerve due to an ear infection, damage during ear surgery, or herpes simplex virus infection. It can cause one side of the face to droop and affect the ability to wrinkle the forehead, close the eye, or pucker the lips.
Other symptoms could the patient exhibit:
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Headache
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Tearing
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Loss of sense of taste
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Hypersensitivity to sound in the affected ear
References:
Tortora, G. & Derrickson, B. (2017). The Muscular System. Principles of Anatomy and Physiology (15th ed.). Wiley.
Bell’s Palsy. Johns Hopkins Medicine. (2023). https://www.hopkinsmedicine.org/health/conditions-and-diseases/bells-palsy