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NERVOUS SYSTEMwww.ipostforyou.info

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NERVOUS SYSTEM  Rapid communicating system of

body carrying electromagnetic

impulses   Integrates the information that it

receives from, and coordinates

the activity of, all parts of thebodies

  Performs higher mental functions

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NERVOUS SYSTEM

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COMMONLY USED TERMS

 Gray Matter  It is the collection of nerve cell bodies in

central nervous system

White Matter  In the central nervous system, the

gathering of nerve fibers is called white

matter.

Trats  Bundle of nerve fibers connecting nuclei

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.  .

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CENTR!L NERVOUSSYSTEM"CNS#

  Brain and Spinal

cord

  95 of total

neural tissue

  Perform

integration and

coordination

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$ER%$&ER!L NERVOUS SYSTEM

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Peripheral nervous system

Twelve cranial nerve

Thirty one spinal nerves

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COM$OS%T%ON O' NERVOUSSYSTEM

!he two principal cell types of the nervoussystem are" NEURONS #unctional unit $%citable cells that transmit electrical

signals &rranged in an integrated networ' SU$$ORT%NG CELLS 

(on conducting cells )ells that surround and wrap neurons In the )(S called (euroglia*+lia In the P(S Schwann cells and Satellite cells

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NEURON CL!SS%'%C!T%ON  STRUCTUR!L 

nipolar

single, short process

Bipolar

two processes -a%on and dendrite

/ultipolar

three or more processes

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.  .

(MOTOR/INTERNEURONS)

(SENSORY)(RETINA/GANGLIA OF

VESTIBULOCOCHLEAR N)

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NEURON CL!SS%'%C!T%ON  'UNCT%ON!L 

Sensory -afferent transmit

impulses toward the )(S

/otor -efferent carry impulses

away from the )(S

Interneurons -association neurons

shuttle signals through )(Spathways

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'UNCT%ON!L CL!SS%'%C!T%ON

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SU$$ORT%NG CELLS

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