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

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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

The Basics of a Neuron Cell body with nucleus Axon (carries electrical message) –Note Schwann cells Dendrites (bring stimulus to cell body) Axonal terminus

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

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 CFS and tissue fluid –Cilia beat to move CFS Oligodendrocytes –Myelin sheaths in CNS

Types of Neurons--structural classes

Types of Neurons—where in body

Types of neurons--examples

How do neurons work—action potentials

Measuring membrane potential

Diffusion and action potential

Saltatory conduction and role of Schwann cells

What happens at the end— chemical synapse Neuro-muscular junction is synapse between motor unit and muscle cell (motor unit)