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Chpt 4 part 1


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Chpt 4 part 1

  1. 1. Chapter 4: The Nervous System
  2. 2. Components of the Nervous SystemHomeostasisHumans must maintain their environment within certain limits Temperature Acidity Water content Sodium content Glucose concentrationsPsychoactive drugs impact homeostasis
  3. 3. The Nervous Systems Somatic nervous system (SNS)  Sensory information  Voluntary actions Autonomic nervous system (ANS)  Sympathetic branch  Parasympathetic branch Central nervous system (CNS)  Brain  Spinal cord
  4. 4. The Brain: Major StructuresCerebral cortex**CerebellumLimbic system**Brain stem**
  5. 5. Cerebral Cortex “Gray Matter” Maintain cognitive functioning Divided into lobes:  Parietal  Frontal  Temporal  Occipital
  6. 6. Limbic System Emotional brain  Drives  Pleasure  Formation of memories Nucleus Accumbens  Central part of limbic system  “Reward Pathway”
  7. 7. Brain Stem Extension of spinal cord Small but “mighty” All information from body to major parts of brain goes through brain stem
  8. 8. Chemical Theories of Behavior Variations in behavior explained through changes in brain chemistry  Historical and cultural perspectives  Monoamine theory of mood  Issue of experimental support Brain imaging techniques  Types  Reactions