Question

Lower motor neuron lesions of the facial nerve result in ipsi-lateral paralysis of the upper and lower muscles of facial expression. What is the consequence of destruction of the facial nucleus or CN VII anywhere along its course?

1) Ipsilateral paralysis of the upper and lower muscles of facial expression
2) Contralateral paralysis of the upper and lower muscles of facial expression
3) Bilateral paralysis of the upper and lower muscles of facial expression
4) No effect on the muscles of facial expression

Answer 1

Lower motor neuron lesions of the facial nerve result in ipsi-lateral paralysis of the upper and lower muscles of facial expression.

Step-by-step explanation:

A lesion on the lower motor neuron (LMN) of the facial nerve would result in flaccid paralysis of the upper and lower muscles of facial expression on the same side as the lesion. This is because the LMN serves as the final pathway for signals from the brain to reach the muscles.

Therefore, if there is damage to the facial nucleus or the facial nerve anywhere along its course, it would lead to ipsilateral paralysis of the facial muscles.