11 nervous system

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11 nervous system

  1. 1. Teacher Prep neuron parts / types of neurons handout
  2. 2. Vertebrate Nervous Systems Two major subsystems: 1. central nervous system (CNS) 2. peripheral nervous system (PNS)
  3. 3. Central Nervous System Two main components: 1. brain 2. spinal cord
  4. 4. Miami Project – Spinal Cord Injury Research
  5. 5. Peripheral Nervous System Contains two main nerve types: 1. somatic nerves  involved with voluntary movement senses / movement 1. autonomic nerves  involved with involuntary movement sympathetic / parasympathetic systems
  6. 6. Cells of the Nervous System Two major cell types: 1. neurons  conduct electrical signals 1. glial cells  structural & insulating support for neurons
  7. 7. dendrites axon terminal soma node of Ranvier axon nucleus glial cell
  8. 8. Neuron Signalling How do electrical signals pass through cells? Membrane Potential glial cells provide insulation for electrical impulses to pass through axon glial cell membrane has a lot of lipid molecules called a myelin sheath when wrapped around an axon
  9. 9. Grey / White Matter Why are brains said to be made of grey and white matter? white matter – neurons with myelin sheath grey matter – neruons without myelin sheath
  10. 10. Grey / White Matter
  11. 11. Sensory Neuron also known as afferent neurons carries signals from sensory receptors to the CNS for processing photoreceptors (eyes) chemoreceptors (nose) thermoreceptors (skin) found in clusters of neurons—ganglia
  12. 12. Interneuron also known as association neurons receives incoming signals from sensory neurons delivers outgoing signals to neurons responsible for responses
  13. 13. Motor Neuron also known as efferent neurons connected to tissues that respond according what was detected muscle contraction gland secretion
  14. 14. Neuron Responses Does all information detected by your senses go through your brain? reflex arc – connects sensory and motor neurons without going to the brain
  15. 15. Neuron Repair Do neurons regenerate? Yes. Peripheral system neurons will repair faster than central system neurons.

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