Ch10 - CHAPTER 10: Sensory Physiology K. Wells VPHY3100:...

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CHAPTER 10: Sensory Physiology K. Wells VPHY3100: Elements of Physiology College Vet. Med.
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Wells/VPHY3100 Lecture Outline Introduction to sensory physiology The four attributes of a stimulus that are encoded by our nervous system Somatosensory perception Visual perception The chemical senses: gustation & olfaction The auditory system: hair cells
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Wells/VPHY3100 Sensory Physiology How we perceive our environment Three common steps associated with any sense: A physical stimulus Sensory transduction: transformation of sensory input into nerve impulses Formulation of “perception”, or our conscious experience of that sensation Six sensory systems Somatosensory Touch Proprioception Temperature Pain Visual Auditory Vestibular Olfactory Gustatory
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Wells/VPHY3100 Sensory Physiology Four basic types of information conveyed by each sensory system: Modality of stimulus Intensity of stimulus Time course of stimulus Location of stimulus The sensory cells Some are themselves neurons Most are specialized epithelial cells that synapse on adjacent sensory neurons Four functional classes of sensory receptors Mechanoreceptors Chemoreceptors Thermoreceptors Photoreceptors Sensory receptors at the protein level: Channels (e.g. stretch receptors) GPCR’s (e.g. photoreceptors of retina)
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Wells/VPHY3100 Lecture Outline Introduction to sensory physiology The four attributes of a stimulus that are encoded by our nervous system Somatosensory perception Visual perception The chemical senses: gustation & olfaction The auditory system: hair cells
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Wells/VPHY3100 Four Attributes of a Stimulus Modality Intensity Time course Location
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Wells/VPHY3100 “The five senses”: Taste Touch Smell Sight Sound Additionally, we include: Other somatic senses Pain Temperature Itch Proprioception Sense of balance (vestibular system) Each sensory receptor responds to a particular modality
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Ch10 - CHAPTER 10: Sensory Physiology K. Wells VPHY3100:...

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