Bell's palsy is a type of facial paralysis that results in what?

Bell's palsy is a type of facial paralysis that results in what?

• A. Inability to control the facial muscles on the affected side
• B. Loss of taste
• C. Hearing loss
• D. Loss of eye blink reflex

Answer: (A)

Bell's palsy is a unilateral lower motor neuron palsy of the facial nerve (cranial nerve VII) that controls the muscles of facial expression. Because the nerve is damaged after it exits the brainstem, all muscles on the affected side become weak or paralyzed, so you cannot voluntarily control those facial muscles on that side. This is why the best answer is the inability to control the facial muscles on the affected side. Some related features can include taste changes on the front part of the tongue due to the chorda tympani branch, and difficulty closing the eye because of eyelid muscle weakness, but hearing loss is not typical. The key distinction is that Bell's palsy causes a full unilateral facial weakness, whereas other conditions like stroke may spare the forehead due to different neural pathways.

Bell's palsy is a unilateral lower motor neuron palsy of the facial nerve (cranial nerve VII) that controls the muscles of facial expression. Because the nerve is damaged after it exits the brainstem, all muscles on the affected side become weak or paralyzed, so you cannot voluntarily control those facial muscles on that side. This is why the best answer is the inability to control the facial muscles on the affected side. Some related features can include taste changes on the front part of the tongue due to the chorda tympani branch, and difficulty closing the eye because of eyelid muscle weakness, but hearing loss is not typical. The key distinction is that Bell's palsy causes a full unilateral facial weakness, whereas other conditions like stroke may spare the forehead due to different neural pathways.