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neuron & nervous system -fernando- biodeluna

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neuron & nervous system -fernando- biodeluna

  1. 1. Neuron & Nervous System
  2. 2. Nervous System
  3. 3. <ul><li>The central nervous system is comprised of the brain and spinal cord . </li></ul><ul><li>The peripheral nervous system includes all peripheral nerves . </li></ul>
  4. 5. C.N.S. <ul><li>Cerebrum </li></ul><ul><li>Cerebellum </li></ul><ul><li>Brain stem </li></ul>
  5. 6. Nerves <ul><li>Nerves  Collections of neurons that are joined together by connective tissue. </li></ul>
  6. 7. The Neuron <ul><li>The basic functional unit of the nervous system. </li></ul>
  7. 8. Function: <ul><li>Send impulses to and from the Central Nervous System and Peripheral Nervous System and the effectors (muscles/glands) </li></ul>
  8. 10. <ul><li>Dendrite  Fine hair-like extensions on the end of a neuron. </li></ul><ul><ul><li>Function : receive incoming stimuli. </li></ul></ul><ul><li>Cell Body or Soma  The control center of the neuron. </li></ul><ul><ul><li>Function: Directs impulses from the dendrites to the axon. </li></ul></ul><ul><li>Nucleus  Control center of the Soma. </li></ul><ul><ul><li>Function: Tells the soma what to do. </li></ul></ul><ul><li>Axon  Pathway for the nerve impulse (electrical message) from the soma to the opposite end of the neuron. </li></ul><ul><li>Myelin Sheath  An insulating layer around an axon, It is made up of Schwann cells. </li></ul><ul><li>Nodes of Ranvier  Gaps between schwann cells. </li></ul><ul><ul><li>Function: Saltatory Conduction (Situation where speed of an impulse is greatly increased by the message ‘jumping’ the gaps in an axon). </li></ul></ul>
  9. 11. Types of Neurons
  10. 12. Transmission of signals
  11. 13. The Synapse
  12. 14. Neurotransmitters
  13. 15. Reflex arc
  14. 17. http://www.bbc.co.uk
  15. 18. Which one is a … ? motor neuron interneuron sensory neuron a) b) C)
  16. 19. Consists of: Brain and Spinal Cord brain Spinal Cord Cerebellum Cerebrum Medulla Oblongata

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