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Francis Nervous System PT 1

This is an overview of the nervous system.

Tony Francis

on 15 February 2012

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Transcript of Francis Nervous System PT 1

fig. 1
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Organization of Nervous System
Nervous Tissue
Support cells in the CNS are grouped together as “neuroglia”
Function: to support, insulate, and protect neurons
Abundant, star-shaped cells
Brace neurons
Form barrier between capillaries and neurons
Control the chemical environment of the brain
Spiderlike phagocytes
Dispose of debris
Ependymal cells
Line cavities of the brain and spinal cord
Circulate cerebrospinal fluid
Wrap around nerve fibers in the central nervous system
Produce myelin sheaths
Satellite cells
Protect neuron cell bodies
Schwann cells
Form myelin sheath in the peripheral nervous system
Cell body
Nissl substance
Specialized rough endoplasmic reticulum
Intermediate cytoskeleton
Maintains cell shape
Neurons = nerve cells
Cells specialized to transmit messages
Major regions of neurons
Cell body—nucleus and metabolic center of the cell
Processes—fibers that extend from the cell body
Cell body
Large nucleolus
Processes outside the cell body
Dendrites—conduct impulses toward the cell body
Axons—conduct impulses away from the cell body
Axons end in axonal terminals
Axonal terminals contain vesicles with neurotransmitters
Axonal terminals are separated from the next neuron by a gap
Synaptic cleft—gap between adjacent neurons
Synapse—junction between nerves
Functional Classification of Neurons
Sensory (afferent) neurons
Carry impulses from the sensory receptors to the CNS
Cutaneous sense organs
Proprioceptors—detect stretch or tension
Motor (efferent) neurons
Carry impulses from the central nervous system to viscera, muscles, or glands
Interneurons (association neurons)
Found in neural pathways in the central nervous system
Connect sensory and motor neurons
Structural Classification of Neurons
—many extensions from the cell body
—one axon and one dendrite
-have a short process leaving the body
Be sure to read 202-210
in your book and review
what you we just went
over on my webpage!!
And you will be smart!!
Full transcript