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Divisions of the Nervous System

Divisions of the Nervous System. HB&H Chapter 7.2 Pages 196-202. The Nervous System (NS) is divided into 2 parts: Central NS : the brain and spinal cord Peripheral NS : all the nerves outside of the Central NS. Central Nervous System. The Central NS is the control center of the body

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Divisions of the Nervous System

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  1. Divisions of the Nervous System HB&H Chapter 7.2 Pages 196-202

  2. The Nervous System (NS) is divided into 2 parts: • Central NS: the brain and spinal cord • Peripheral NS: all the nerves outside of the Central NS

  3. Central Nervous System • The Central NS is the control center of the body • The Brain controls most functions in the body • Spinal Cord is a thick column of nerve tissue that links the brain to the Peripheral NS.

  4. The Brain • Estimated to contain 100,000,000,000 Interneurons • Has 3 layers of connective tissue • Between the outermost and middle layer, there is watery fluid for protection.

  5. Cerebrum • Largest part of your brain • Three Functions: • Interprets input from senses • Controls skeletal muscles • Performs complex mental processes (Remembering, learning, and making judgments)

  6. Cerebrum • Divided into 2 halves or Hemispheres • Each half controls the opposite side of your body • Right hemisphere is the “creative” side • Left hemisphere is the “logical” side

  7. Cerebellum & Brain Stem • The Cerebellum coordinates the actions of your muscles and helps you keep your balance • The Brain Stem controls the involuntary muscle actions.

  8. Exit Pass • What is the difference between the Central and Peripheral Nervous systems?

  9. Peripheral NS Page 200 • Where do nerve pairs originate from? • How are nerves like a road or highway? • What are the differences between Somatic and Autonomic nerves?

  10. Peripheral NS Page 200 • Where do nerve pairs originate from? • 12 pairs start in the brain, the other 31 begin in the spinal cord • How are nerves like a road or highway? • Impulses travel in two directions – to and from the Central NS.

  11. Peripheral NS Page 200 • What are the differences between Somatic and Autonomic nerves? • Voluntary actions are controlled by Somaticnerves and involuntary actions are controlled byAutonomicnerves.

  12. Reflexes Page 201 • Define a Reflex • Describe everything that happens when you touch a sharp object. • Why is the difference in time between your Reflex and the feeling of pain important?

  13. Reflexes Page 200 • Define a Reflex • An automatic response that occurs without conscious control.

  14. Reflexes Page 200 • Describe the neuron actions that happens when you touch a sharp object. • Sensory neurons send an impulse to interneurons in the spinal cord • 2. Motor neurons get the impulse and cause your hand to jerk away from the object.

  15. Reflexes Page 200 • Why is the difference in time between your Reflex and the feeling of pain important? • By removing yourself from harm before your feel it, you prevent further or more serious injury.

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