Anatomy of the Inner Ear
Timothy C. Hain, MD
Page last modified:
June 18, 2009
While there are several other surveys of inner ear anatomy, we have diffidently
here set out to put the content in our lecture on this subject on the web.
Overview of peripheral anatomy

- Mechanical sensors (canals and otoliths) respond to angular and linear movement
- The semicircular canals are very small rings -- about 1 cm in diameter. The image below taken from a CT scan shows that the anterior canal is less than 1 cm - -smaller than a dime !
- There are three semicircular canals - -the anterior, superior and horizontal. Between the three canals the brain can determine rotational velocity in three dimensions.
- There are also two otolith organs (click here for more). The otoliths respond to linear acceleration such as gravity or changing velocity of movement in a straight line.
- Cochleo-Vestibular(8th) cranial nerve (click here
for an animation if viewing on the site DVD)
- Spiral (cochlear) and Scarpa's (vestibular) ganglion
- Brainstem nuclei
Also see: Virtual ear at MEEI (Harvard)
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© Copyright
June 18, 2009
, Timothy C. Hain, M.D.
All rights reserved.
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June 18, 2009
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