A&P Ch-15 - Ch-15 Neural Integration 1 Oct-15-2015...

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Ch-15 Neural Integration 1 Oct-15-2015 A & P Fall-2015 1 Bio-2870 Anatomy and Physiology Chapter 15 Neural Integration 1: Sensory Pathways and the somatic Nervous System
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Ch-15 Neural Integration 1 Oct-15-2015 A & P Fall-2015 2
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Ch-15 Neural Integration 1 Oct-15-2015 A & P Fall-2015 3 Sensory Information Figure 15 1 An Overview of Neural Integration. (ed-9) 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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Ch-15 Neural Integration 1 Oct-15-2015 A & P Fall-2015 4 Figure 15 1 An Overview of events occurring along the sensory and motor pathways
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Ch-15 Neural Integration 1 Oct-15-2015 A & P Fall-2015 5 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: PNS Nuclei: CNS Tracts: CNS Somatic Nervous System (SNS) Motor neurons and pathways that control skeletal muscles
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Ch-15 Neural Integration 1 Oct-15-2015 A & P Fall-2015 6 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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Ch-15 Neural Integration 1 Oct-15-2015 A & P Fall-2015 7 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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Ch-15 Neural Integration 1 Oct-15-2015 A & P Fall-2015 8 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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Ch-15 Neural Integration 1 Oct-15-2015 A & P Fall-2015 9 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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Ch-15 Neural Integration 1 Oct-15-2015 A & P Fall-2015 10 Sensory Receptors Adaptation Reduction in sensitivity of a constant stimulus Your nervous system quickly adapts to stimuli that are painless and constant A) Central B) peripheral 1) Tonic receptors Are always active Show little peripheral adaptation Are slow-adapting receptors
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