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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-medullathalamus-auditory cortex
Overall anatomy of the human ear
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external ear (air)
middle ear (air)
inner ear (liquid)
vestibular
cochlear
tympanic
http://www.innerbody.com/anim/ear.html
http://www.blackwellscience.com/matthews/ear.html
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
The semicircular canals - detect
rotational (angular) acceleration