intro to NS - neural and gilial structure 2 Flashcards by Cassie Lee | Brainscape

Q

What is the NS composed of

A

nerves and glial cells

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Q

What glial cells are in PNS

A

Schwann cells

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Q

glial cells in CNS

A

astrocytes
oligodendrocytes
microglia

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Q

function of Schwann cells

A

productice myelin sheath

nutrient to non myelinated neuroens

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Q

function of oligodendrocytes

A

myelinate axons

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Q

what is myelin made of

A

layers of lipid in membrane of glial cells

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Q

function of astocytes

A

nutrition of neurones

repair and scarring after injury

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Q

function of microglial

A

defensive cells, remove debris

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Q

what are neuronal cell bodies in PNS

A

ganglia

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Q

what are neuronal cell bodies in CNS

A

nuclei

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Q

what are groups of nerve axons in PNS

A

anatomical nerves

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Q

what are groups of axons in CNS

A

tracts

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Q

how are PNS axons bound together

A

connective tissue sheaths

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Q

3 sheaths in the PNS axons

A

epineurium
perineurium
endoneurium

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Q

what is the epineurium

A

outer layer of all neurones

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Q

purpose of perineurium

A

hold facials together

Q

purpose of endoneurium

A

wrap around individual axons

Q

what do sensory axons join together to form

A

dorsal root

Q

what do motor axons job to form

A

ventral root

Q

what is the white matter in the CNS

A

axons/tracts

Q

what is the grey matter in the CNS

A

dendrites
cell bodies
synapses

Q

Where do the sensory terminals lie

A

SC

periphery

Q

where does the cell body of the sensory neurones lie

A

middle of the two terminals within the dorsal root ganglion

Q

what does the dorsal root ganglion contain

A

all cell bodies of sensory axons

Q

where do the sensory axons synapse

A

dorsal horn of SC

Q

where are the cell bodies of motor neurones found

A

ventral horn of SC

Q

what is the grey matter divided into

A

ventral and dorsal horn

Q

how do motor neurones move from their origin

A

motor neurones from ventral horn

axons run through ventral roots to join pheriphal nerves