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

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

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

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

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

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

Node h of

Ranvier

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Brain and cranial nerves and Spinal cord and Spinal Nerves

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Peer-reviewed | Manuscript received: February 13, 2013 ... · cranial nerves (VII., IX., X.) innervate the taste buds and transmit taste in- formation to the Nucleus tractus solitarius

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14-10 Cranial Nerves Cranial Nerves 12 pairs connected to brain Four Classifications of Cranial Nerves Sensory nerves - carry somatic sensory information, including touch, pressure,

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New York Civil Liberties Union...3901X Transmit - Transmit - 4137 X Transmit - 41 Transmit - 4202X Transmit - 4207 X Transmit - 4223)( Transmit - Transmit Transmit - Transmit - 4295)(

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section 5, chapter 11 cranial nerves and spinal nerves

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Nerves and Stimuli - Frostburg State UniversityNerves and Stimuli Bundles of nerve cells called neurons Nerves receive and transmit signals Stimuli signal changes in the environment

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