The forces experienced when spinnig cause the fluid inside them to move around and activate the sensitive regions/hairs inside. This makes the body think that it is oriented a particular way when it has moved on from that point. When the fluid suddenly catches up, it confuses the signals sent to the brain causing nausea.
when you spin, fluid in your semicircular canals begin to move. they touch the hairs on your nerves. This causes your brain to think that you are oddly positioned, and therefore, you go into vertigo!
Semicircular Canals
The semicircular canals and the vestible are responsible for balance.
semicircular canals
The semicircular canals are three loops of interconnected canals within the inner ear which are responsible for detecting angular acceleration. The three canals are the superior posterior and lateral canals. These canals meet at the common crus or the ampulla. Superior semicircular canal Posterior semicircular canal Lateral semicircular canalThe three canals meet at the common crus or the ampulla. The ampulla is a small pouch-like structure that contains a fluid known as the endolymph. The ampulla is located at the base of the semicircular canals and serves as a sensory organ for maintaining balance and equilibrium.
semicircular canals
semicircular ducts
Semicircular Canals
cerebellum
semicircular canals
ampulla
labyrinthitis