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    Vertigo
   
Vertigo

Rotational head movements cause the fluid in the cupula of the semicircular canal to "bend" the hair cells. The hair cells, in turn, send a signal to your brain that you are experiencing "motion".

Vertigo can occur when these hair cells are still sending signals of motion, even though you may be perfectly still, giving you the  "illusion of movement". 

Review Date: 5/1/2011
Reviewed By: Linda J. Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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