Download - Nerve Intro Fbs 6 Mt Histo
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NERVE TISSUE
FBS VI
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Structurally the nervous system is dividedinto (2) :
1. Central nervous system (2)
Brain
Spinal cord
2. Peripheral nervous system (2)
Nerve fibers
Nerve ganglia
Nerve endings
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Structurally, nerve tissue consists of 2 cell types
* Neuron (nerve cells)
* Glial cells
support and protect neurons,and participate in neural activity, neuralnutrition, and the defense processes of thecentral nervous system.
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NEURONNerve cells, or neurons, are responsible for
:
The reception, transmission, and processing
of stimuli
The triggering of certain cell activities
The release of neurotransmitters and other
informational molecules.
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Most neurons consist of three parts :
Cell body (perikaryon)
Dendrites
Axon
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Ultrastructure of Neuron
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Neurones and Methods of Study With Light Microscopy
Axon
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NEUROGLIA
Astrocytes
Oligodendrocytes
Microglia
Ependymal cell
Schwann cells
Satelite cells
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ASTROCYTE
Fibrous Astrocytes
Protoplasmic Astrocytes
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OLIGODENDROCYTE
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MICROGLIA
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Gray matter has six layersof cells with different formsand sizes.
Neurons of some regions of the cerebral cortex registerafferent(sensory) impulses; in other regions,efferent(motor) neurons generate motor impulsesthat control voluntary movements.
Cells of the cerebral cortex are related to theintegration of sensory information and the initiationof voluntary motor responses.
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Horizontal & radial axons associated with neuronalcells in different layerslaminated appearance
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SPINAL CORD