Structure of nerves Coordination and response
Nerve tissue <ul><li>Made up of neurones </li></ul><ul><li>Size and shape of neurones differ in different parts of the ner...
Axon terminals Myelin sheath Nodes of Ranvier Cell body Axon Nucleus Dendrites Section 35-2 A Neuron Structure of a neurone
Activity :   Labeling of neuron worksheet
 
 
Function of neurones: <ul><li>Receptors  sense the environment (chemicals, light, sound, touch) and encode this informatio...
Sequence of neurones Receptors (sense organ) sensory neurone Intermediate/relay neurone motor neurone effector
- conducts impulses  away  from cell body - insulating layer - provides nourishment for fibre 5 - conducts impulses  towar...
What neuron is this? Motor neuron
Nerve Cells
Cross section of  myelin sheaths  that surround  axons  (TEM x191,175)
Activity :  Labeling of neurones in the Human Nervous System worksheet 2
 
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Chapter 13 The Nervous System Lesson 2 - The Structure of Nerves

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Chapter 13 The Nervous System Lesson 2 - The Structure of Nerves

  1. 1. Structure of nerves Coordination and response
  2. 2. Nerve tissue <ul><li>Made up of neurones </li></ul><ul><li>Size and shape of neurones differ in different parts of the nervous system </li></ul><ul><li>Perform same function (transmit impulses) </li></ul>Structure of a nerve bundle
  3. 3. Axon terminals Myelin sheath Nodes of Ranvier Cell body Axon Nucleus Dendrites Section 35-2 A Neuron Structure of a neurone
  4. 4. Activity : Labeling of neuron worksheet
  5. 7. Function of neurones: <ul><li>Receptors sense the environment (chemicals, light, sound, touch) and encode this information into electrochemical messages that are transmitted by sensory neurones </li></ul><ul><li>Sensory neurones carry signals from the outer parts of your body (periphery) into the central nervous system </li></ul><ul><li>Intermediate/relay neurones connect various neurones within the brain and spinal cord </li></ul><ul><li>Motor neurones carry signals from the central nervous system to the outer parts (muscles, skin, glands) of your body </li></ul>
  6. 8. Sequence of neurones Receptors (sense organ) sensory neurone Intermediate/relay neurone motor neurone effector
  7. 9. - conducts impulses away from cell body - insulating layer - provides nourishment for fibre 5 - conducts impulses towards cell body 1 2 3 4 - speeds up transmission of impulses along fibre - junction between 2 neurones; impulses transmitted by chemical means (neurotransmitters) - where end branch of axon comes in contact with muscle fibre
  8. 10. What neuron is this? Motor neuron
  9. 11. Nerve Cells
  10. 12. Cross section of myelin sheaths that surround axons (TEM x191,175)
  11. 13. Activity : Labeling of neurones in the Human Nervous System worksheet 2

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