Discover how the often-underestimated vestibule influences our posture and muscle tone. A quick connection between perception and movement essential for our balance!
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The vestibule not only stabilizes our gaze; it also controls postural tone through fast pathways connecting sensors to the spinal cord.
Otoliths → lateral vestibular nuclei → lateral vestibulospinal tract → extensor motor neurons. Inclination → almost reflexive contraction.
Head rotation → medial vestibular nucleus → medial vestibulospinal tract → cervical motor neurons. The vestibulo-colic reflex keeps the head stable.
Vestibular nuclei → reticular formation. Pons = increased tone, medulla = decreased tone. Adjusts postural stiffness according to the task.
The vestibule maintains a baseline level on extensors; without it, posture collapses despite intact cortical motor activity.
Hypofunction → widened gait, backward falls. Vestibular + optokinetic rehabilitation → -50% sway in 6 weeks.
The vestibule is the primary antigravity circuit; it regulates tone in real-time to maintain balance and precise movements.
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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