E.2c Ears

20/01/2014 § Leave a comment

This is the perfect time for me to mention that my ears are really good so do not even try to whisper bad things about me when I’m nearby.

That is an ear, and we have to label the different parts in a diagram as part of the syllabus. The things that are absolutely necessary to include are:

  • pinna
  • eardrum
  • bones of middle ear
  • oval window
  • round window
  • semicircular canals
  • auditory nerve
  • cochlea

The ear perceives sound using little tiny hair  cells in the cochlea – I literally know this because of my math exploration, isn’t that just fantastic. Sound waves vibrate the hair cells, drawing reactions from the eardrum, the bones of the middle ear, and the oval and round windows. The vibrations of the hair bundles transmit action potentials to the auditory nerve, sending a signal to the auditory cortex in the brain. And this happens very fast, as I’m sure you all know.

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