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MINI II nervous tissue
NA`
27
Business
Graduate
03/01/2010

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Term

Nissl Bodies

what are they and where are they found?

Definition

used for protein synthesis and transport in nuronal cell body.

conatin roughe er and free ribosomes and polyribosomes

Term

Pre synaptic and post synaptic densities are what?

 

Definition
pre and post synaptic membranes
Term
sensory neuron are what type of neuron?
Definition
psedu unipolar
Term
oligodendrocytes
Definition

similar to schwann cells.

make myelin

darkest staining

can wrape multiple axons several times.

Myelin = plasmalemma

Term
Astrocyte
Definition
largest most plentiful cell in cns. contain Glial fibrillar acid protein  GFAP
Term
PROTOPLASMIC ASTROCYTE
Definition

Astrocyte found in grey matter.

Have Pedicles

suck ions from blood vessels from the pedicle

Term
Fibrous Astrocyte
Definition
Found in white matter. suck ions from blood vessels via perivascular foot.
Term
Stain for astrocytes?
Definition
golgi stain
Term

microglial cells

 

origin?

Definition

CNS macrophages.

 

Bone marrow.

Term
Ependymal cells
Definition

Low columnar or cuboidal cells which line ventrcle of central canal, brain and spinal cord.

 

contain cilia and microvilli to circulate fluid.

 

contain Na channels and create an osmo gradient

Term
Glial Limitans
Definition
Sort of protective barrier formed from astrocyte end feet
Term
Multiple Sclerosis
Definition

Auto Ab's to own oligodendrocytes. Demyelination in cns

F>M

Term
Mesaxon
Definition
inner and outer lip of the concentric circles of myelin made by Schwann cells
Term
what covers schwann cells and nodes of ranvier?
Definition
basal lamina
Term
schwidt lanterman clefts
Definition
bubbles of cytoplasm in myelin sheath
Term
What 2 structures can be seen in the concentric myelin circles around peripheral neurons?
Definition

Major Dense lines and

Intraperiod lines

Term
Describe conduction along an unmyelinated nerve fiber
Definition
single layer of axon means Na channels exist down the entire length -> continous conduction
Term

multipolar neurons are what type?

 

Definition

motor

autnomic ganglia

Term
Satelite cells
Definition
cuboidal cells which cover cell body and provide insulation
Term
Neuronal Cell bodies and dendrites are found in what part of cns?
Definition
grey matter
Term
myelinated nerve fibers are found where in cns?
Definition
white matter
Term
Cortex consists of what kind of matter?
Definition
grey matter
Term

where are veinous sinuses found?

 

Definition
in dura matter
Term
what makes the BBB?
Definition

endothelial cells of the capillaries with their tight junctions

+ end feet of astrocytes

Term

Cerebral Cortex has how many layers?

 

name the 3 important ones

Definition

6

 

Molecular

Purkinje

Granule Cell Layer

 

White matter

Term
steps in regeneration of axon
Definition

1) chromatolysis

2) anetrograde wallerian degeneration

3) regernation

Term
gliosis
Definition
astrocytic scar formed by astrocytes repairing damaged neuron/ dead
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