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10 Cards in this Set
- Front
- Back
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Neuroglia in the CNS |
- Astrocytes - Oligodendrocytes - Microglia - Ependymal Cells |
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Neuroglia in the PNS |
- Schwann Cells (Neurolemmocytes) - Satellite Cells |
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Nerve |
- A nerve is a bundle of nerve cell fibers (axons and dendrites) that follow the same path - Usually contains both sensory and motor neurons - Found only in the PNS |
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Tract |
- A bundle of nerve cell fibers- Found only in the CNS |
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Ganglia |
- Clusters of neuron cell bodies - Found only in the PNS |
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Nuclei |
- Clusters of neuron cells bodies (one cluster is called a nucleus - Not to be confused with a cell's nucleus) - Found only in the CNS |
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Blood-Brain Barrier |
- Protective barrier that keeps harmful substances out of the brain - Astrocytes form a wall around the outside of the blood vessels |
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Myelin Sheath |
- Formed by concentric layers of white fatty material called myelin or myelin sheath - Myelin protects and insulates the axons of many nerve cells in both the CNS and the PNS |
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Myelin Sheath in the PNS |
- Neurolemmocytes (Schwann cells) form the sheath; the plasma membrane is called the neurolemma, which is responsible for nerve regeneration |
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Myelin Sheath in the CNS |
- Oligodendrocytes form the sheath; there is no plasma membrane, and following an injury to nervous tissue, astrocytes "bull" their way in and form a dense tangle of processes that block any regrowth of neurons. |
