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Overview of the Nervous System

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Functions of the Nervous System. Sensory: detect internal and external stimuli. Afferent neurons ... Autonomic Nervous System (ANS) ... – PowerPoint PPT presentation

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Title: Overview of the Nervous System


1
Overview of the Nervous System
2
Structures of the Nervous System
  • Brain
  • Cranial Nerves
  • Spinal Cord
  • Spinal Nerves
  • Ganglia
  • Enteric Plexuses
  • Sensory Receptors

3
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4
Functions of the Nervous System
  • Sensory detect internal and external stimuli
  • Afferent neurons
  • Integrative processes sensory information
  • Perception
  • Interneurons
  • Motor elicit an appropriate response
  • Efferent neurons
  • Effectors (muscles and glands)

5
Organization of the Nervous System
  • Central Nervous System (CNS)
  • Brain
  • Spinal Cord
  • Peripheral Nervous System (PNS)
  • All nervous tissue outside the CNS

6
Central Nervous System
  • Processes different kinds of incoming sensory
    information
  • Source of thoughts, emotions, and memories

7
Peripheral Nervous System
  • Somatic Nervous System (SNS)
  • Sensory neurons that carry information from
    somatic receptors to the CNS
  • Motor neurons that conduct impulses from the CNS
    to skeletal muscles
  • Voluntary

8
  • Autonomic Nervous System (ANS)
  • Sensory neurons carry information from autonomic
    sensory receptors to the CNS
  • Motor neurons conduct nerve impulses from the CNS
    to smooth muscle, cardiac muscle, and glands
  • Sympathetic division
  • Parasympathetic division
  • Involuntary

9
  • Enteric Nervous System (ENS)
  • Involuntary
  • Neurons in enteric plexuses that extend the
    length of the gastrointestinal (GI) tract
  • Sensory neurons monitor chemical changes and
    stretching
  • Motor neurons control contraction of GI tract
    smooth muscle to propel food and secretions

10
Nervous System
Central Nervous System
Peripheral Nervous System
Brain
Spinal Cord
Enteric Nervous System
Autonomic Nervous System
Somatic Nervous System
Sympathetic Nervous System
Parasympathetic Nervous System
11
Motor part of PNS
Sensory part of PNS
Effectors
SNS
CNS brain and spinal cord
Somatic and special sensory receptors and neurons
Somatic motor neurons (voluntary)
Skeletal muscles
ANS
Autonomic sensory receptors and neurons
Autonomic motor neurons (involuntary)
sympathetic and parasympathetic divisions
Smooth muscle, cardiac muscle, and glands
ENS
Sensory receptors and neurons in GI tract and
enteric plexuses
Enteric motor neurons (involuntary) in enteric
plexuses
Smooth muscle, glands, and endocrine cells of GI
tract
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