system
Given the following post, respond as if you're commenting on Reddit:
human
Why can completely paralyzed people often blink voluntarily?
gpt
Blinking is a motor function controlled by the facial nerve, the seventh cranial nerve. Cranial nerves come directly from the brainstem, bypassing the spinal cord. Cranial nerve reflexes are often used to assess levels of brain function (diencephalon, mesencephalon, and medulla).