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4.4 nervous tissue * l: brain, spinal cord, nerves * f: transmit information

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

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Page 1: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information

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

Page 2: 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

Page 3: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information

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

Page 4: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information

inside brain:microglia – support neurons, engulf bacteriaastrocytes – provide nutrients to neuronsoligodendrocytes – form myelin (insulation)

Page 5: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information

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

Node h of

Ranvier

Page 6: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information
Page 7: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information
Page 8: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information
Page 9: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information
Page 10: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information
Page 11: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information
Page 12: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information
Page 13: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information

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