Neurons

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Neurons

• Neurons and neuroglia
• (multiple sclerosis and neuroglia)
• Where are neurons in the body?
• Types of neurons and their functions
• How do neurons work?
• Action potentials
• Synapses

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The Basics of a Neuron

• Cell body with nucleus
• Axon (carries message)
• Note Schwann cells
• Dendrites (bring stimulus to cell body)
• Axonal terminus

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Neurons and neuroglial cells

• Axon in peripheral nervous system with myelin
  sheeth formed by Schwann cells
• Provides for insulation and allows for saltatory
  propagation of action potentials

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Neuroglial cells in CNS
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Neuroglial cells in CNS

• Astrocytes
• Most abundant and versatile
• Control chemical environment around neurons
• Also signal among themselves with slow chemical
  signals
• Microglia
• Monitor health of neurons and transform into
  immune macrophages (normal immune cells have no
  access to CNS)
• Ependymal cells
• Line cavities of brain/CNS
• Barrier between CSF and tissue fluid
• Cilia beat to move CSF
• Oligodendrocytes
• Myelin sheaths in CNS

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Types of Neurons--structural classes
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Types of Neuronswhere in body
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Types of neurons--examples
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How do neurons workaction potentials
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Measuring membrane potential
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Diffusion and action potential
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Saltatory conduction and role of Schwann cells
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What happens at the endchemical synapse

• Neuro-muscular junction is synapse between motor
  unit and muscle cell (motor unit)

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