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🌀 How does the inner ear keep you balanced?

Fluid canals and crystal-loaded otoliths report head motion so eyes and posture stay steady.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

A motion lab inside the skullDescribe canals for rotation and otolith organs for gravity/linear acceleration.Three fluid canals sense spins; utricle and saccule use dense crystals for gravity and linear acceleration. Together they instrument the head.
Hair cells and the brain handshakeExplain hair-cell coding, VOR, and multisensory balance fusion.Mechanical bend becomes neural rates. VOR stabilizes gaze. Vision and proprioception vote with the ears.
When signals disagreeFrame vertigo as false motion reports, adaptation, and cochlea vs vestibular roles.Mismatched or distorted vestibular signals feel like spinning. The brain can adapt. Hearing and balance share a labyrinth but different sensors.

Questions this course answers

What do the semicircular canals primarily detect?

Each canal’s endolymph lags during head rotation, deflecting the cupula and hair cells to encode angular motion.

Match each piece to what it does

Canals and otoliths split rotation vs linear/gravity sensing; VOR stabilizes vision; proprioception is a separate body-position channel fused for balance.

In your own words, why can a ship make some people feel motion-sick even when they are sitting still on deck?

Inner ears report acceleration and tilt from the vessel; eyes and expectations may not match, creating conflict associated with motion sickness.

Grounded in trusted sources

Purves et al., Neuroscience — vestibular system chapters
Kandel, Schwartz & Jessell (or later eds.), Principles of Neural Science — balance and VOR
NIH / NIDCD educational pages on balance disorders and vestibular anatomy
Guyton and Hall Textbook of Medical Physiology — vestibular sense overview

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