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Nervous System
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22
Anatomy
11th Grade
10/14/2010

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Cards

Term
Dendrites
Definition
nerve fibers, carry impulses TOWARD cell body
Term
Axon
Definition
nerve fibers,carry impulses AWAY from cell body
Term
Nissl bodies
Definition
provides protien molecules needed for the tranmission of nerve signals
Term
Nodes of Ranvier
Definition
gaps in myelin sheath, increase speed of nerve impulse
Term
Telodendria
Definition
distal, branching tips of axon
Term
__ types of neurons
Definition
3
Term
Multipolar neuron
Definition
found in brain and spinal cord; many dendrites, 1 axon
Term
Bipolar neuron
Definition
found in eye, ear, olfactory pathways; least numerous
Term
Unipolar neuron
Definition
always a sensory neuron
Term
Glia
Definition
support neurons, do not conduct info
Term
__ types of glia
Definition

5

 

-astrocytes

-microglia

-ependymal cells

-oligodendrocytes

-schwann cell

Term
Astrocytes
Definition
"feeds" the neuron, helps from blood-brain barrier; largest & most numerous
Term
Microglia
Definition
phagocytosis ability
Term
Ependymal cells
Definition
line fluid filled cavities in brain & spinal cord
Term
Oligodendrocytes
Definition
produces myelin sheath around nerve fibers in CNS
Term
Schwann cell
Definition

produces fatty myelin sheath around nerve fibers in PNS

 

-neuritemma: sheath, essential to regeneration of injured nerve fibers; regeneration will only occur if neurilemma & cell bodies are intact

Term
White matter
Definition
myelinated nerve fibers
Term
Gray matter
Definition
made up of cell bodies & unmyelinated fibers in CNS; ganglia & unmyelinated fiber in the PNS
Term
Endoneurium
Definition
surrounds each nerve fiber
Term
Fasicles
Definition
bundles of nerve fibers with their endoneurium
Term
Derineurium
Definition
surround fasicles
Term
Epineurium
Definition
surrounds complete nerve
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