Sensory ReceptorsCopyrighteTheMcGraw-Hill Companies,Inc.Permission requiredforreproduction ordisplaySkinsurfaceDermisEpidermisA-Tactile(Meissner's)corpuscle(lighttouch)B-Tactile(Merkle's)corpuscles(touch)C-Free nerve ending (pain)D-Lamellated(Pacinian)corpuscle(vibrationanddeeppressure)E-Ruffinicorpuscle(warmth)
Sensory Receptors
Sense OrgansAspecializedorganorstructurewherereceptorcellsareconcentrated and supported by affiliated cellsTypes- Eye vision-Ear hearingequilibrium-Innerear e- Nose smellontralsulcus- Tongue tasteSomatosensoryFrontal lobecortexassoclationParietal lobeareaassociationAuditoryareacortexTastecortexVisualcortexOccipitallobeassociationareaTemporallobeassociationarea
Sense Organs • A specialized organ or structure where receptor cells are concentrated and supported by affiliated cells. • Types - Eye vision - Ear hearing - Inner ear equilibrium - Nose smell - Tongue taste
General Properties of Sensory ReceptorsAdequatestimulusAparticular formof energyto whichareceptor ismostsensitiveMechanoreceptor,chemoreceptor,electromagneticreceptor(photoreceptor),thermolreceptor,voltagereceptorandetcSensorytransductionReceptor can converse the energy of stimulus into the electric energy ofactionpotential-anintermediatestepb/wstimulusandnerveimpulses-stationarydepolarizationofareceptor-graded accordingto stimulus intensity-receptorpotentialandgeneratorpotential(slow,transitional)
General Properties of Sensory Receptors • Adequate stimulus A particular form of energy to which a receptor is most sensitive Mechanoreceptor, chemoreceptor, electromagneticreceptor (photoreceptor), thermolreceptor, voltage receptor and etc. • Sensory transduction Receptor can converse the energy of stimulus into the electric energy of action potential - an intermediate step b/w stimulus and nerve impulses - stationary depolarization of a receptor - graded according to stimulus intensity - receptor potential and generator potential (slow, transitional)
General Properties of Sensory ReceptorsCopyrightTheMcGraw-HillCompanies,Inc.Permissionrequiredforreproduction ordisplayStimulusStimulus intensityReceptormembraneMyelinReceptorpotentials(mV)FirstnodeofRanvierThresholdActionpotentialsatfirstnodeofRanvierIntoCNSActionpotentialsdowntheaxonOAxonterminal withneurotransmitter
General Properties of Sensory Receptors
General Properties of Sensory ReceptorsStimulusfeaturesareelectricallyencodedAparticular formof energytowhichareceptor ismostsensitiveFrequency,PopulationThresholdActionpotentialresoldStimuGeneratoxAUThresholdotentisDOET
General Properties of Sensory Receptors • Stimulus features are electrically encoded A particular form of energy to which a receptor is most sensitive Frequency, Population