ch15ppt - 15-1Chapter 15Sensory, Motor &...

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Unformatted text preview: 15-1Chapter 15Sensory, Motor & Integrative SystemsLevels and components of sensationPathways for sensations from body to brainPathways for motor signals from brain to bodyIntegration Processwakefulness and sleeplearning and memory15-2Is Sensation Different from Perception?Sensation is any stimuli the body is aware ofWhat are we not aware of?X-rays, ultra high frequency sound waves, UV lightWe have no sensory receptors for those stimuliPerception is the conscious awareness & interpretation of a sensation.precisely localization & identificationmemories of our perceptions are stored in cortex15-3Sensory ModalitiesDifferent types of sensationstouch, pain, temperature, vibration, hearing, visionEach type of sensory neuron can respond to only one type of stimuliTwo classes of sensory modalitiesgeneral senses somatic are sensations from body wallsvisceral are sensations from internal organsspecial senses smell, taste, hearing, vision, and balance15-4Process of SensationSensory receptors demonstrate selectivityrespond to only one type of stimuliEvents occurring within a sensationstimulation of the receptortransduction (conversion) of stimulus into a graded potentialvary in amplitude and are not propagatedgeneration of impulses when graded potential reaches thresholdintegration of sensory input by the CNS15-5Sensory ReceptorsSelectively respond to only one kind of stimuliHave simple or complex structuresGeneral Sensory Receptors (Somatic Receptors)no structural specializations in free nerve endings that provide us with pain, tickle, itch, temperaturessome structural specializations in receptors for touch, pressure & vibration Special Sensory Receptors (Special Sense Receptors)very complex structures---vision, hearing, taste, & smell15-6Classification of Sensory ReceptorsStructural classificationType of response to a stimulusLocation of receptors & origin of stimuliType of stimuli they detect15-7Structural Classification of ReceptorsFree nerve endingsbare dendritespain, temperature, tickle, itch & light touchEncapsulated nerve endingsdendrites enclosed in connective tissue capsulepressure, vibration & deep touchSeparate sensory cellsspecialized cells that respond to stimulivision, taste, hearing, balance15-8Structural ClassificationCompare free nerve ending, encapsulated nerve ending and sensory receptor cell15-9Classification by Response to StimuliGenerator potentialfree nerve endings, encapsulated nerve endings & olfactory receptors produce generator potentialswhen large enough, it generates a nerve impulse in a first-order neuronReceptor potentialvision, hearing, equilibrium and taste receptors produce receptor potentialsreceptor cells release neurotransmitter molecules on first-order neurons producing postsynaptic potentialsPSP may trigger a nerve impulseAmplitude of potentials vary with stimulus intensity15-10...
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ch15ppt - 15-1Chapter 15Sensory, Motor &...

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