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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