A patient showing inability to close the right corner of the mouth is most probably suffering form_______________?
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Answer: B. Bell’s palsy
Explanation
Bell palsy involves acute paralysis of the seventh cranial nerve controlling facial expressions. Weakness or paralysis prevents proper closure of the mouth corner on the affected side. Patients lose the ability to smile symmetrically or whistle due to orbicularis oris dysfunction. The facial nerve innervates all the muscles responsible for facial expression and movement. Bell palsy is widely considered to result from viral inflammation and subsequent nerve swelling. Symptoms usually develop rapidly over a period of hours to a few days.
Early administration of systemic corticosteroids significantly improves the rate of complete facial recovery. Patients must protect their eye on the affected side from dryness and corneal abrasion. Differential diagnosis must exclude central nervous system strokes causing similar facial drooping. Myasthenia gravis causes generalized muscle fatigue rather than acute unilateral facial paralysis. TMJ dysfunction syndrome causes jaw pain and clicking without acute facial nerve paralysis. Multiple sclerosis presents with disseminated neurological deficits rather than isolated facial nerve palsy.
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