muscles affected:
1. frontalis action: raising eyebrows and causes horizontal wrinkles on the forehead
2. orbicularis oculi action: involuntary blink and voluntary ink
3. orbicularis oris action: closing and protraction of lips
4. buccinator action: compresses the cheeks against the teeth; aids in mastication
5. platysma action: pulling down the mandible and lowering the lips
mechanism of his muscle weakness:
Although many cases of Bell's palsy have no clear cause, it could be caused by a viral infection that causes swelling and irritation of the 7th cranial nerve that controls one side of the face. This causes the side of the face to experience sudden weakness and droop.
other symptoms that a patient with Bell's palsy may exhibit
- Aphasia (difficulty with or loss of speaking ability)
- Blurred or double vision
- partial or total loss of one or more senses
- Dizziness
- Emotional instability and personality changes