Chapters 9, 10, 12

Chapters 9, 10, 12 - Chapter 9 Histology of the Nervous...

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Chapter 9 Histology of the Nervous Tissue 1
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nervous system overview l Nervous system ¡ Monitors and processes sensory information from the environment and from within the body l Principal cell populations ¡ Neuron ¡ Neuroglia 2
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The Anatomy of a Neuron 3
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l Nissl bodies – clusters of RER and ribosomes l Dendrites ¡ Receptive region l Axon or nerve fiber ¡ Nerve impulse generator and transmitter ¡ Axon hillock ¡ Axon terminal or synaptic knobs ¡ Collaterals with telodendria Neuron structure 4
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Neuron structure l Synaptic terminals ¡ Presynaptic membrane ¡ Synaptic vesicles l neurotransmitter ¡ Synaptic cleft ¡ Postsynaptic membrane 5
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6
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Neurons l They make up the gray matter of the nervous system l Clusters of neuron, dendrites, unmyelinated axons and neuroglias are called: ¡ Nuclei if they are located in the CNS ¡ Ganglia if they are located in the PNS 7
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Axons or nerve fibers l Covered by myelin ¡ Fatty material secreted by Schwann cells in the PNS ¡ Fatty material secreted by oligodendrocytes in the CNS ¡ Myelin insulates the axons 8
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9
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Chapters 9, 10, 12 - Chapter 9 Histology of the Nervous...

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