Nervous System Introduction

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Nervous System IntroductionThe nervous system includes neural tissu ...The nervous system includesCNSIncludes the brain and spinal cordResponsible for integrating, processing, ...Sensory data gives information about int ...Motor commands control and adjust activi ...PNSIncludes all neural tissue outside of th ...Delivers sensory information to CNS via ...Bundles of axons organized with associat ...Nerves that exit the brain directly are ...Nerves that exit the spinal cord are cal ...DivisionsAfferentSensory receptors monitor the internal a ...IncludesVisceral sensory receptors, Somatic sens ...These receptors send information via aff ...CNS processes informationEfferentCNS sends out motor command via motor ax ...RegulatesSomatic nervous systemSkeletal musclesAutonomic nervous systemParasympathetic divisionRest and digest, affects smooth muscles, ...Sympathetic divisionFight or flight, smooth muscles, cardiac ...
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Nervous System Introduction
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The nervous system includes neural tissue plus supporting blood vessels and connective tissue.
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The nervous system includes
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CNS
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Includes the brain and spinal cord
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Responsible for integrating, processing, and coordinating sensory data and motor commands
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Sensory data gives information about internal and external environment
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Motor commands control and adjust activities of peripheral organs (including skeletal muscles)
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PNS
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Includes all neural tissue outside of the CNS
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Delivers sensory information to CNS via afferent pathways, carries motor commands from CNS via efferent pathways
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Bundles of axons organized with associated connective tissue and blood vessels (called nerves) carry this information to and from CNS
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Nerves that exit the brain directly are referred to as cranial nerves (12 pairs)
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Nerves that exit the spinal cord are called spinal nerves (31 pairs)
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Divisions
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Afferent
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Sensory receptors monitor the internal and external environment
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Includes
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Visceral sensory receptors, Somatic sensory receptors, and Special sensory receptors,
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These receptors send information via afferent pathways axons to CNS
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CNS processes information
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Efferent
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CNS sends out motor command via motor axons
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Regulates
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Somatic nervous system
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Skeletal muscles
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Autonomic nervous system
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Parasympathetic division
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Rest and digest, affects smooth muscles, cardiac muscles and glands
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Sympathetic division
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Fight or flight, smooth muscles, cardiac muscles and glands