Intro to nervous system

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Intro to nervous system

  1. 1. Construct Interactive Notes7 pages of binder paperOn cover, write• Chapter 8: Nervous System• Name, period, seat #• Color illustration
  2. 2. Introduction to the Nervous System (pg 2)
  3. 3. StructuresCentral Nervous System (CNS)
  4. 4. StructuresCentral Nervous System (CNS)• Brain: 100 billion neurons
  5. 5. StructuresCentral Nervous System (CNS)• Brain: 100 billion neurons• Spinal cord: 100 million neurons
  6. 6. StructuresCentral Nervous System (CNS)• Brain: 100 billion neurons• Spinal cord: 100 million neuronsPeripheral Nervous System (PNS)
  7. 7. StructuresCentral Nervous System (CNS)• Brain: 100 billion neurons• Spinal cord: 100 million neuronsPeripheral Nervous System (PNS)• Nerves: bundles of 100-1000 axons
  8. 8. StructuresCentral Nervous System (CNS)• Brain: 100 billion neurons• Spinal cord: 100 million neuronsPeripheral Nervous System (PNS)• Nerves: bundles of 100-1000 axons• Ganglia: Small masses of neuron cell bodies located outside the CNS.
  9. 9. StructuresCentral Nervous System (CNS)• Brain: 100 billion neurons• Spinal cord: 100 million neuronsPeripheral Nervous System (PNS)• Nerves: bundles of 100-1000 axons• Ganglia: Small masses of neuron cell bodies located outside the CNS.• Sensory receptors: Located in skin, eyes, ears, nose, and mouth
  10. 10. Functions1. Sensory input: Receptors detect external and internal stimuli. This information is carried to the brain via nerves.
  11. 11. Functions1. Sensory input: Receptors detect external and internal stimuli. This information is carried to the brain via nerves.2. Integration: The brain processes and analyzes the sensory information and decides on appropriate responses
  12. 12. Functions1. Sensory input: Receptors detect external and internal stimuli. This information is carried to the brain via nerves.2. Integration: The brain processes and analyzes the sensory information and decides on appropriate responses3. Motor output: The nervous system causes a response by stimulating effectors (muscles and glands)
  13. 13. Functions1. Sensory input: Receptors detect external and internal stimuli. This information is carried to the brain via nerves.2. Integration: The brain processes and analyzes the sensory information and decides on appropriate responses3. Motor output: The nervous system causes a response by stimulating effectors (muscles and glands)Example: You are driving and see a red light (sensory input). Your brain integrates this information (red light means “stop”) and your foot goes for the brake (motor output)
  14. 14. Neurons• Conduct electrical impulses
  15. 15. Neurons• Conduct electrical impulses• Neurons in CNS are amitotic
  16. 16. Neurons• Conduct electrical impulses• Neurons in CNS are amitotic• Three parts: – Cell body: Contains nucleus and organelles
  17. 17. Neurons• Conduct electrical impulses• Neurons in CNS are amitotic• Three parts: – Cell body: Contains nucleus and organelles – Dendrites: Short, highly branched extensions. Receive input and transfer impulses to the cell body
  18. 18. Neurons• Conduct electrical impulses• Neurons in CNS are amitotic• Three parts: – Cell body: Contains nucleus and organelles – Dendrites: Short, highly branched extensions. Receive input and transfer impulses to the cell body – Axon: Only 1 per neuron. Long branch that carries impulses away from cell body. Often covered by a segmented, fatty myelin sheath
  19. 19. • Draw a diagram of a neuron
  20. 20. Types of neuronsType Transmits Structure Location impulses:Sensory From sense Long Dendrites: PNS receptors to dendrites, Cell Body: CNS short axon Ganglia (PNS) Axon: CNSMotor From CNS to Short Dendrites and muscles and dendrites, Cell Body: CNS glands long axon Axon: PNSAssociation From sensory Variable Dendrites, Cell neurons to Body, and Axon: motor CNS neurons
  21. 21. Output (pg 3)• Draw a sensory neuron and a motor neuron• Label the dendrites, cell body, and axon in each and say whether each part is located in the CNS or the PNS

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