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Lecture Oct-20-11 Chapter 15 updated

Lecture Oct-20-11 Chapter 15 updated - Oct202011 Oct202011...

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Oct-20-2011 Bio 2870 A & P Ch-15  Neural Integration 1 1 Introduction to Anatomy and Physiology Chapter  15  Neural Integration 1: Sensory  Pathways and the somatic Nervous  System
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Oct-20-2011 Bio 2870 A & P Ch-15  Neural Integration 1 2 Sensory Information Figure 15–1 An Overview of Neural Integration. Afferent Division of the  Nervous System Receptors Sensory neurons Sensory pathways Efferent Division of the  Nervous System Nuclei Motor tracts Motor neurons
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Oct-20-2011 Bio 2870 A & P Ch-15  Neural Integration 1 3 Sensory Information Sensory Receptors Specialized cells that monitor specific conditions in the body or  external environment When stimulated, a receptor passes information to the CNS in the  form of action potentials along the axon of a sensory neuron Sensory Pathways Deliver somatic and visceral sensory information to their final  destinations inside the CNS using Nerves Nuclei Tracts Somatic Nervous System (SNS) Motor neurons and pathways that control skeletal muscles
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Oct-20-2011 Bio 2870 A & P Ch-15  Neural Integration 1 4 Sensory Receptors Sensation The arriving information from these senses Perception Conscious awareness of a sensation General Senses  Describe our sensitivity to Temperature Pain Touch Pressure Vibration Proprioception
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Oct-20-2011 Bio 2870 A & P Ch-15  Neural Integration 1 5 Sensory Receptors The special senses are provided by special sensory  receptors Special sensory receptors Are located in sense organs such as the eye or ear Are protected by surrounding tissues Special Senses Olfaction (smell) Vision (sight) Gustation (taste) Equilibrium (balance) Hearing
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Oct-20-2011 Bio 2870 A & P Ch-15  Neural Integration 1 6 Sensory Receptors Figure 15–2 Receptors and Receptive Fields The Detection of Stimuli Receptor sensitivity Each receptor has a  characteristic sensitivity Receptive field Area is monitored by a  single receptor cell The larger the receptive  field, the more difficult it is  to localize a stimulus
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Oct-20-2011 Bio 2870 A & P Ch-15  Neural Integration 1 7 Sensory Receptors The Interpretation of Sensory Information Arriving stimulus  Takes many forms: physical force (such as pressure) dissolved chemical sound Light Sensations  Taste, hearing, equilibrium, and vision provided by specialized  receptor cells Communicate with sensory neurons across chemical synapses
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Oct-20-2011 Bio 2870 A & P Ch-15  Neural Integration 1 8 Sensory Receptors Adaptation Reduction in sensitivity of a constant stimulus Your nervous system quickly adapts to stimuli that are 
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