FIVE MUSCLES
- Frontalis (part of the Occipitofrontalis)
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Draws scalp anteriorly, raises eyebrows,and wrinkles skin of forehead horizontally
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- Orbicularis oculi
- closes eye
- closes eye
- Orbicularis oris
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Closes and protrudes lips, as in kissing; compresses lips against teeth; shapes lips during speech
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- Buccinator
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Presses cheeks against teeth and lips, as in whistling, blowing, and sucking; draws corner of mouth laterally; and assists in mastication (chewing) by keeping food between the teeth (and
not between teeth and cheeks)
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- Platysma
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Draws outer part of lower lip inferiorly and posteriorly as in pouting; depresses mandible
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MECHANISM OF MUSCLE WEAKNESS
Bell's palsy is a condition that causes facial muscles to become temporarily paralyzed and unable to be controlled. Although it is said to have no definite cause, Bell's palsy occurs when the seventh cranial nerve (the one controlling facial expressions) is inflamed and not working correctly. It usually only affects one side of the face, causing the facial features on one side to "droop"--examples of this are presented in patient AM: drooping corner of the mouth, loss of nasolabial fold, and drooping eye.
OTHER SYMPTOMS
- Drool
- Feel pain in jaw or behind ear on the affected side
- Headaches
- Have less sense of taste
- Have dry eyes and mouth
- Tinnitus
- Sound sensitivity on affected side
- Difficulty in speaking
- Difficulty in eating and drinking
Bell's Palsy: Symptoms, diagnosis & treatment. Cleveland Clinic. (2020). Retrieved September 23, 2022, from https://my.clevelandclinic.org/health/diseases/5457-bells-palsy
Sachdev, P. (2021). Bell's palsy - what is Bell's Palsy? what causes it? WebMD. Retrieved September 23, 2022, from https://www.webmd.com/brain/understanding-bells-palsy-basics
Taylor, D. C. (2021, May 4). Bell Palsy. Medscape. Retrieved September 23, 2022, from https://emedicine.medscape.com/article/1146903-overview#:~:text=These%20nerves%20serve%20the%20muscles,%2C%20buccinator%2C%20and%20platysma%20muscles.