Chapter 13 Part 1 PNS

Chapter 13 Part 1 PNS - Part1 System(PNS...

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The Peripheral Nervous  System (PNS) Part 1 Angela Peterson-Ford, PhD [email protected]
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Chapter 13 The Peripheral Nervous  System (PNS) Part 1
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PNS – all neural structures outside the brain and  spinal cord Includes sensory receptors, peripheral nerves,  associated ganglia, and motor endings Provides links to and from the external  environment Peripheral Nervous System  (PNS)
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PNS in the Nervous System Figure 13.1
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Structures specialized to respond to  stimuli Activation of sensory receptors results in  depolarizations that trigger impulses to the CNS The realization of these stimuli, sensation and  perception, occur in the brain Sensory Receptors
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Mechanoreceptors  – respond to touch, pressure,  vibration, stretch, and itch Thermoreceptors  – sensitive to changes in  temperature Photoreceptors  – respond to light energy (e.g.,  retina) Chemoreceptors  – respond to chemicals (e.g.,  smell, taste, changes in blood chemistry) Nociceptors  – sensitive to pain-causing stimuli Receptor Classification by  Stimulus Type
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Respond to stimuli arising outside the body Found near the body surface Sensitive to touch, pressure, pain, and  temperature Include the special sense organs Receptor Class by Location:  Exteroceptors
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Respond to stimuli arising within the body Found in internal viscera and blood vessels Sensitive to chemical changes, stretch, and  temperature changes Receptor Class by Location:  Interoceptors
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Respond to degree of stretch of the organs they  occupy Found in skeletal muscles, tendons, joints,  ligaments, and connective tissue coverings of  bones and muscles Constantly “advise” the brain of one’s movements Receptor Class by Location:  Proprioceptors
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Receptors are structurally classified as either  simple or complex Most receptors are  simple  and include  encapsulated  and  unencapsulated  varieties Complex  receptors are  special sense  organs Receptor Classification by  Structural Complexity
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Free dendritic nerve endings Respond chiefly to temperature and pain Merkel (tactile) discs Hair follicle receptors Simple Receptors:  Unencapsulated
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Meissner’s corpuscles (tactile corpuscles)  Pacinian corpuscles (lamellated corpuscles) Muscle spindles, Golgi tendon organs, and  Ruffini’s corpuscles Joint kinesthetic receptors Simple Receptors:  Encapsulated
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Simple Receptors:  Unencapsulated Table 13.1.1
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Simple Receptors:  Encapsulated Table 13.1.2
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Simple Receptors:  Encapsulated Table 13.1.3
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Simple Receptors:  Encapsulated Table 13.1.4
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Survival depends upon sensation and perception Sensation is the awareness of changes in the 
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