5 muscles affected and its actions
- Frontalis - raises eyebrows and wrinkles forehead
- Orbicularis oculi - closes the eyelids
- Orbicularis oris - closes, protrudes and compresses the lips
- Buccinator - Compresses cheeks into teeth for chewing
- Platysma muscles - depresses mandible and lower lip. tenses the skin of the anterior neck
Mechanism of his muscle weakness
- Damage to facial or seventh cranial nerve which leads to weakness or paralysis of these muscles.
Other symptoms: Headache, loss of feeling in the face, Pain around the jaw, Pain in or behind the ear of the affected side, loss of taste, Difficulty in making facial expressions