Discover the vestibular system, your biological gyroscope! Learn how it detects movement and gravity to stabilize your gaze and posture.
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The vestibular system is the internal sensor of movement and gravity in humans. Nestled in the inner ear, it serves as a biological gyroscope: it detects every head tilt, every linear or rotational acceleration, then triggers reflexes that stabilize gaze, adjust postural tone, and inform the brain about the body's orientation.
| Sensors | Anatomy | Detected stimulus | Key function |
|---|---|---|---|
| Semicircular canals | Three perpendicular tubes filled with endolymph, ending with the ampullary crista | Angular accelerations (rotations) | Trigger the vestibulo-ocular reflex (VOR) |
| Otoliths (utricle & saccule) | Maculae covered with otoconia (calcium carbonate crystals) | Linear accelerations and position relative to gravity | Regulate the tone of extensors and the perception of verticality |
The vestibular system is the key organ for oculo-postural stability: without it, looking up, turning your head, or simply standing would become a constant challenge.
Sixty seconds on one foot, eyes closed, on a foam cushion. The pelvis stays stable, the ankle works finely, the athlete could hold for another minute. Ten minutes later, during a change of direction with a ball and an opponent in contact, the same support slips and the same athlete falls to the ground. Same ankle, same person, same session.
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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.