Cells of the nervous system Flashcards Preview

Functional Histology VBMS 408 > Cells of the nervous system > Flashcards

Flashcards in Cells of the nervous system Deck (21):
1

Neuroglia

supporting cells for neurons

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What are the functions for neuroglia cells?

physical support, protection, facilitate nerve impulses, injury repair, regulates internal fluid environment, removes neurotransmiteer substances from synaptic cleft, exchange metabolites between nervous and criculatory systems

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Nissil bodies

small clumps of RER stain with toluidine Blue stain

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What are the CNS neuroglial cells?

MOAE; Microglial cells; ependymal cells; oligodendrocytes; astrocytes

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What are the PNS neuroglial cells?

SS: Schwann Cells and Satelite cells

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Astrocyte types

Fibrous astrocytes, protoplasmic astrocytes,

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What is the largest type of neuroglial cell?

astrocytes

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What protein is used to identify astrocytes?

Glial Fibrillary Acidic Protein (GFAB)

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What are the functions of astrocytes?

Nutrition acquistion and wate elimination ; covers nodes of ranvier; rids synaptic cleft of excess neurons, works with pia matter to form the blood brain barrier; regulates K+ concentration; forms neuropil

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Neuropil

fine meshwork in areas devoid of neurons. Formed by astrocytes

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Oligodendrocytes

smaller in size to astrocytes with fewer, less branching processes

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Where are oligodendrocytes found?

in columns between axons

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What is the function of oligodendrocytes

Form myelin sheath around CNS axons

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Microglial cells

(Cells of hortega) smallest, small darkly staining with a thin layer of cytoplasm

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What is the function of microglial cells?

removing invading organisms, neoplastic cells; injured cells; cellular debrisl lmoderate immune reactions

16

Ependymal cells

Forms single layer of cubodial to columnar shaped cells lining brain ventricles and central canal of spinal cord; modified at areas within ventricles to work with capillary loops (choroid plexus) .

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Function of Ependymal cells

Works in the transport of fluid and secreted materials to form cerebrospinal fluid

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Schwann Cells

Develop from neural crest ectoderm

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Function of Schwann cells

support myelinated and unmyelinated neurons; removes cellular debris; guides regrowth of PNS axons; insulates axons; increases speed of conduction of nerve impulses

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Satellite cells

Single layer of small cuboidal cells covering the surface of ganglia

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What is the function of satellite cells?

insulate ganglia; provide route for metabolic exchange