Question

Lesions to CN V result in loss of facial sensations on the ipsi-lateral side. What are the possible effects of these lesions?

1) Loss of pain and temperature sensation (spinal trigeminal nucleus)
2) Loss of tactile sensation (main sensory nucleus)
3) Muscle weakness (motor nucleus)
4) All of the above

Answer 1

Lesions to CN V can result in loss of pain and temperature sensation, loss of tactile sensation, and muscle weakness.

Step-by-step explanation:

Lesions to the trigeminal nerve, or CN V, can result in various effects on facial sensations. These effects include:

1. Loss of pain and temperature sensation: This is caused by lesions to the spinal trigeminal nucleus, which receives information about pain and temperature from the face and relays it to the thalamus and cortex.
2. Loss of tactile sensation: This occurs due to lesions to the main sensory nucleus of the trigeminal nerve, which processes touch, pressure, vibration, and proprioception.
3. Muscle weakness: Lesions to the motor nucleus of CN V can result in muscle weakness in the muscles innervated by the trigeminal nerve.

Therefore, the correct answer is 4) All of the above.