Chapter 4: Body Tissues and Membranes ~ 4.4 Nervous Tissue

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4.4 Nervous Tissue

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  • found in brain and spinal cord

  • contains neurons and supporting cells called neuroglia

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Receives signal

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contains nucleus

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conducts signal to next cell

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neuroglia

  • nervous tissue cells more numerous than neurons

  • nourish and support neurons

  • no impulse

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4 types of neuroglia

microglia, astrocytes, oligodendrocytes, & ependymal cells

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Microglia

engulf bacteria and cellular debris

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Astrocytes

provide nutrients to neurons

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Oligodendrocytes

form myelin

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Ependymal

line ventricles and cavities

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Schwann cells

  • neuroglia located outside brain or spinal cord

  • produce myelin sheath on neurons outside of brain or spinal cord

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What are the gaps between myelin sheaths called?

Nodes of Ranvier