neuron & nervous system -fernando- biodeluna
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neuron & nervous system -fernando- biodeluna

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neuron nervous system-

neuron nervous system-
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 neuron & nervous system -fernando- biodeluna neuron & nervous system -fernando- biodeluna Presentation Transcript

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