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23 Cards in this Set
- Front
- Back
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reticular theory (and who thought of it)
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Camillo Golgi. Believed cells in brain formed continuous network
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Neuronal theory
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Ramon y Cajal. brains made up of single cells, communicate via synapses
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Two basic cell types in nervous system
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neurons and glia
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Glia
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Structural support for neurons. form blood-brain barrier, myelin sheath, remove debris and neurochemicals.
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Microglia
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phagocytes; mobilized after infection
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Macroglia
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three types: astrocytes, oligodendrocytes, and schwann cells
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Astrocytes
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in CNS, most numerous type of glia. maintain proper chemical environment
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oligodendrocytes
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myelin producing cells of CNS (can create multiple myelin sheaths from one cell)
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Schwann Cells
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Myelin producing cells of the PNS (one cell= one myelin sheath)
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Ependymal cells
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maintain blood brain barrier
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extracellular recording
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place electrode near a neuron. Measures action potentials
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intracellular recording
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place electrode inside neuron. Measures graded potentials as well as action potentials
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Afferent neurons
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carry information toward the brain
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efferent neurons
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carry information away from the brain
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axon collaterals
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branches along the length of the axon (infrequent)
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Nerve impulse
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action potential
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dendrites
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receive incoming signals from other nerve cells
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Where are nerve cell bodies located in the PNS?
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in the ganglia
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Nuclei
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compact accumulations of neurons having roughly similar connections in the CNS
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cortices (cortex)
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sheets of cells of similar function
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nerves
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bundles of axons, enveloped by glial cells that myelinate them
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white matter
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areas of axon tracts
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grey matter
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areas of cell bodies.
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