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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