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Microscopic anatomy of nervous system
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Transcript of Microscopic anatomy of nervous system
![Page 1: Microscopic anatomy of nervous system](https://reader031.fdocuments.net/reader031/viewer/2022020103/5899d8e51a28ab4a0b8b6077/html5/thumbnails/1.jpg)
Peripheral nerves
• Are composed of bundles of nerve fibers held together by connective tissue and a specialized layer of cells, the perineurium.
• The connective tissue consists of a outer layer, the epineurium, surrounding the whole nerve,
the perineurium, surrounding the bundles of nerve fibers, and
the endoneurium associated with individual nerve fibers
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Peripheral nerve
Axon
Myelin space
Schwaan cell nucleus
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Cross section of a thick nerve showing the epineurium, perineurium, and endoneurium. The myelin sheath that envelops each axon was partially removed by the histologic technique.
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Cerebrum
• This micrograph shows a low-magnification view of the cerebral cortex. It includes the full thickness of the grey matter and a small amount of white matter at the bottom of the micrograph.
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There are six layers in the cerebral cortex• i) the plexiform layer: consists largely of fibers, most of
which travel parallel to the surface and relatively few cells, mostly neuroglial cells and occasional horizontal cells of Cajal.
• ii) the outer granular layer: consists small pyramidal cells, granule cells and stellate cells
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• iii) the outer pyramidal cells layer : contain medium pyramidal cells
• iv) inner granular layer: contain many small granular cells
• v) inner pyramidal cells layer • vi) the polymorphic cells
layer
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Cerebellum
• It consists of a core of white matter and the superficially located gray matter. The grey matter is subdivided into three layers,
1. the outer molecular layer,2. a middle Purkinje cell layer3. and the inner granular layer
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1. The outer molecular layer:
contains relatively few neurons (stellate and basket cells) and large numbers of unmyelinated fibers .
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2. A middle Purkinje cell layer:
the Purkinje cells have very large cell bodies, a relatively fine axon extending through the granular cell layer and an extensively branching dendritic system which arborises into the outer molecular layer
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3. The inner granular layer:
contains numerous small neurons , the non-myelinated axons. It also contain golgi cells scattered in the superficial part of the granular cell layer
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Cerebellum
• White matter
• Gray matter
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Cerebellum
1.the outer molecular layer,
2. a middle Purkinje cell layer
3. the inner granular layer
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Cerebellum
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