chapter 10, part a
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Chapter 10, part A. Sensory Physiology. About this Chapter. What are the senses How sensory systems work Body sensors and homeostatic maintenance Sensing the external environment Mechanisms and pathways to perception. General Properties of Sensory Systems. Stimulus Internal External - PowerPoint PPT PresentationTRANSCRIPT
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
Dee Unglaub Silverthorn, Ph.D.
HUMAN PHYSIOLOGY
PowerPoint® Lecture Slide Presentation byDr. Howard D. Booth, Professor of Biology, Eastern Michigan University
AN INTEGRATED APPROACH
T H I R D E D I T I O N
Chapter 10, part ASensory Physiology
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
About this Chapter
• What are the senses • How sensory systems work• Body sensors and homeostatic maintenance• Sensing the external environment• Mechanisms and pathways to perception
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
• Stimulus• Internal• External• Energy source
• Receptors• Sense organs• Transducer
• Afferent pathway• CNS integration
General Properties of Sensory Systems
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
General Properties of Sensory Systems
Figure 10-4: Sensory pathways
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• Structural types: 1. Simple receptors2. Complex neural3. Special senses
• Types according to the nature of stimulus1. Chemoreceptors2. Mechanoreceptors3. Thermoreceptors4. Photoreceptors
Sensory Receptor Types
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Sensory Receptor Types
Figure 10-1: Sensory receptors
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• Vision• Hearing• Taste• Smell• Equilibrium
Special Senses – External Stimuli
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Special Senses – External Stimuli
Figure 10-4: Sensory pathways
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• Touch• Temperature• Pain• Itch• Proprioception• Pathway
Somatic Senses – Internal Stimuli
Figure 10-10: The somatosensory cortex
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• Receptor• Threshold• Action potential
• Sensory neurons• Primary – medulla • Secondary – thalamus• Tertiary – cortex
• Integration• Receptive field• Multiple levels
Somatic Pathways
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Somatic Pathways
Figure 10-9: Sensory pathways cross the body’s midline
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• Location• Lateral inhibition• Receptive field
• Intensity• Duration• Tonic receptors• Phasic receptors• Adaptation
Sensory Modality
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Sensory Modality
Figure 10-3: Two-point discrimination
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Sensory Modality
Figure 10-6: Lateral inhibition
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• Mechanoreceptors • Free nerve endings• Pacinian corpuscles• Ruffini corpuscles• Merkel receptors• Meisaner's corpuscles• Barroreceptors
Touch (pressure)
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Touch (pressure)
Figure 10-11: Touch-pressure receptors
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• Free nerve endings• Cold receptors• Warm receptors• Pain receptors• Sensory coding:
• Intensity• Duration
Temperature
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Temperature
Figure 10-7: Sensory coding for stimulus intensity and duration
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• Nociceptors• Reflexive path• Itch• Fast pain• Slow pain
Pain and Itching
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Pain and Itching
Figure 10-12: The gate control theory of pain modulation
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Referred Pain
Figure 10-13: Referred pain