More ear - the cochlea is one of the really important parts of the ear and it's anatomy is really tricky to work out because it's so small and is a complex three dimensional structure.
Daily Anatomy App:
For a random human anatomy question every day on your phone you can get my Daily Anatomy question app from the Apple App Store:
https://itunes.apple.com/gb/app/daily-anatomy/id1001729137
or Google Play Store:
https://play.google.com/store/apps/details?id=com.suanatomy.dailyanatomy
Music by Jahzzar
Album: Kuddelmuddel
Song: 2014
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