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

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Unformatted text preview: 15-1Chapter 15Sensory, Motor & Integrative Systems•Levels and components of sensation•Pathways for sensations from body to brain•Pathways for motor signals from brain to body•Integration Process–wakefulness and sleep–learning and memory15-2Is Sensation Different from Perception?•Sensation is any stimuli the body is aware of–What are we not aware of?•X-rays, ultra high frequency sound waves, UV light–We have no sensory receptors for those stimuli•Perception is the conscious awareness & interpretation of a sensation.–precisely localization & identification–memories of our perceptions are stored in cortex15-3Sensory Modalities•Different types of sensations–touch, pain, temperature, vibration, hearing, vision•Each type of sensory neuron can respond to only one type of stimuli•Two classes of sensory modalities–general senses •somatic are sensations from body walls•visceral are sensations from internal organs–special senses •smell, taste, hearing, vision, and balance15-4Process of Sensation•Sensory receptors demonstrate selectivity–respond to only one type of stimuli•Events occurring within a sensation–stimulation of the receptor–transduction (conversion) of stimulus into a graded potential•vary in amplitude and are not propagated–generation of impulses when graded potential reaches threshold–integration of sensory input by the CNS15-5Sensory Receptors•Selectively respond to only one kind of stimuli•Have simple or complex structures–General Sensory Receptors (Somatic Receptors)•no structural specializations in free nerve endings that provide us with pain, tickle, itch, temperatures•some structural specializations in receptors for touch, pressure & vibration –Special Sensory Receptors (Special Sense Receptors)•very complex structures---vision, hearing, taste, & smell15-6Classification of Sensory Receptors•Structural classification•Type of response to a stimulus•Location of receptors & origin of stimuli•Type of stimuli they detect15-7Structural Classification of Receptors•Free nerve endings–bare dendrites–pain, temperature, tickle, itch & light touch•Encapsulated nerve endings–dendrites enclosed in connective tissue capsule–pressure, vibration & deep touch•Separate sensory cells–specialized cells that respond to stimuli–vision, taste, hearing, balance15-8Structural Classification•Compare free nerve ending, encapsulated nerve ending and sensory receptor cell15-9Classification by Response to Stimuli•Generator potential–free nerve endings, encapsulated nerve endings & olfactory receptors produce generator potentials–when large enough, it generates a nerve impulse in a first-order neuron•Receptor potential–vision, hearing, equilibrium and taste receptors produce receptor potentials–receptor cells release neurotransmitter molecules on first-order neurons producing postsynaptic potentials–PSP may trigger a nerve impulse•Amplitude of potentials vary with stimulus intensity15-10...
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This note was uploaded on 05/23/2010 for the course BIO 222 taught by Professor Brooks during the Spring '10 term at Prairie State College .

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

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