4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information.

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Histology of Nervous Tissue
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4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information

A. Neurons * conduct nerve (electrical) impulses * 3 parts: dendrites – short, collect signals cell body – main part, contains nucleus axon – long, passes on nerve impulses

B. Neuroglia (glial cells) * do not conduct nerve impulses * support, protect, and nourish neurons

inside brain: microglia – support neurons, engulf bacteria astrocytes – provide nutrients to neurons oligodendrocytes – form myelin (insulation)

* outside brain/spinal cord: Schwann cells - surround long axons gaps between cells = nodes of Ranvier produce myelin sheath (covering) Node  of Ranvier

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