Learn about the muscle spindle, an essential sensor for our posture and reflexes. Dive into its fascinating anatomy and functions!
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The muscle spindle is a micro-sensor located in almost all muscles. It provides the nervous system with information about the length and speed of muscle stretch, enabling posture and the myotatic reflex.
3–10 intrafusal fibers under a capsule (5–10 mm). Nuclear bags = sensitive to speed; nuclear chains = static length.
Increasing γ command = more conscious hand (fine grasping). Fatigue = spindle gain ↓ → risk of falling.
A muscle length/speed counter, the spindle communicates with α and γ motoneurons for posture, precision, and protection.
Proprioception has become the most used and least understood word in the French-speaking movement field. And this ambiguity is not trivial. As long as it lasts, we prescribe in the fog. We see exercises. We don't see what they engage.
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Read the articleThe RNP system is meant to be read, targeted and tested from your next assessment. Start with the member space, for free.