Since the reflex to close the eyelid once an eyelash is touched seems very fast, does the signal from the neuron detecting the touching travel all the way to the brain, get processed then back to the eyelid muscle?
Or does it have some kind of bypass that activates the eyelid muscle right away as some sort of reflex mechanism?

  • $\begingroup$ I don't think any reflex is controlled by the brain. Then again, I guess it might not be the case for something near the eyes since other reflexes tend to go through the spine's grey matter and the eyelashes obviously don't. $\endgroup$
    – DKNguyen
    Jan 7, 2022 at 4:06
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    – tyersome
    Jan 7, 2022 at 21:55


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