Auditory Sense (Hearing)

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Auditory Sense (Hearing)

• Sense organs ear, cochlea
• Receptor cell hair cell, cilia deflect w/sound
  wave
• Receptor mechanism mechanically-gated cation
  channels allow depolarize in one direction,
  hyperpol in other
• Coding of intensity and direction amount and
  direction of cilia bending, ear coordination
• Coding of pitch which hair cells are deflected
• Pathway of conduction CN VIII-medulla-thalamus-au
  ditory cortex

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Overall anatomy of the human ear
external ear (air) middle ear (air)
inner ear (liquid)
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vestibular
cochlear
tympanic
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http//www.innerbody.com/anim/ear.html
http//www.blackwellscience.com/matthews/ear.html
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Equilibrium

• Sense organs semicircular canals with ampullae
  and utricle and saccule with maculae
• Receptor cell hair cell
• Receptor signal transduction mechanism cilia
  with mechanically-gated cation channels allow
  depolarize in one direction, hyperpol in other
• Coding of intensity and direction amount and
  direction of cilia bending
• Pathway of conduction CNVIII-pons-cerebellum

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The semicircular canals - detect rotational
(angular) acceleration
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