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1013cap - -receptor fields get smaller as sensitivity...

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10/13 cap Phasic receptor: pacinian corpuscle Intero-receptors, mechanoreceptors, internal organs -give them a mechanical disturbance (p 340) and give only AP at start and at end -advantage?—can detect things quicker than trophic -mechanics: give a stepwise mechanical disturbance: fires at onset and offset -nonneuronal tissue and neuronal tissue work together to produce phasicity -take off myelination; now put stimulus on bare nerve ending: if tonic-curved depolarization occur at onset/offset, but do not have a maintained depolarization how many nerve cells needed to do 2-point discrimination: 3 (third receptive field inbetween the 2 cells that isn’t being stimulated)
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Unformatted text preview: -receptor fields get smaller as sensitivity increases ispsilateral: same side of spinal cord contralateral: opp side of spinal cord-both can make synapses at various points when going up/down spinal cord-to get to neocortex: must have at least 2 synapses-adecasation-homunculus pg 359- vertebrate eye path of light thru eye: gets to retina, strikes retina at the portion away from-invertebrate eyes v vertebrate eyes-cornea produces focus: shape of cornea produces most of bend of light-lens produces the fine focus for eye-in front of cornea: needs to be vacuum, can bend light that way...
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