Auditory Sense (Hearing) Sense organs: ear, cochleaReceptor cell: hair cell, cilia deflect w/sound waveReceptor 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 deflectedPathway of conduction: CN VIII-medulla-thalamus-
auditory cortex
* external ear (air) * middle ear (air) * inner ear (liquid)
Overall anatomy of the human ear
vestibular
cochlear
tympanic
http://www.blackwellscience.com/matthews/ear.html
http://www.innerbody.com/anim/ear.html
Equilibrium Sense organs: semicircular canals with ampullae
and utricle and saccule with maculaeReceptor cell: hair cellReceptor 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
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