The myotatic reflex is not really a reflex at all. We think of reflexes as reactions to a distinct input, whereas muscle spindles provide continuous input to the CNS, one that changes in response to changing external conditions and forces. It is this variable input that allows for unconscious control over voluntary muscle and maintenance of optimal muscle tone.
The anatomy and physiology of the reflexes that govern movement
Some patients have weakness in every muscle. In this video we learn how to find them.
The difference between feed-forward and feed-back muscle control