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The Nervous System

The Nervous System. Neurons. --a nerve cell that is specialized to transfer messages in the form of fast-moving electrical energy. Neuron Structure. Cell body contains nucleus & organelles Dendrites—extension of the cell that receives info from other cells

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The Nervous System

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  1. The Nervous System

  2. Neurons • --a nerve cell that is specialized to transfer messages in the form of fast-moving electrical energy

  3. Neuron Structure • Cell body contains nucleus & organelles • Dendrites—extension of the cell that receives info from other cells • Axon carries signals away from cell body • Axons can be almost 1m long • The tip is called the axon terminal

  4. Sensory Neuron • collect Information • Receptors—specialized nerve endings • Detect changes inside and outside the body • Ex. Eye detects light

  5. Motor Neurons • Send impulses from the brain and spinal cord to other systems • Muscles get impulses from Motor Neurons=muscles contract

  6. Nerves • Collection of axons bundled together with blood vessels and connective tissues • Everywhere in PNS

  7. Spinal Cord

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