intro to NS - neural and gilial structure 2 Flashcards
What is the NS composed of
nerves and glial cells
What glial cells are in PNS
Schwann cells
glial cells in CNS
astrocytes
oligodendrocytes
microglia
function of Schwann cells
productice myelin sheath
nutrient to non myelinated neuroens
function of oligodendrocytes
myelinate axons
what is myelin made of
layers of lipid in membrane of glial cells
function of astocytes
nutrition of neurones
repair and scarring after injury
function of microglial
defensive cells, remove debris
what are neuronal cell bodies in PNS
ganglia
what are neuronal cell bodies in CNS
nuclei
what are groups of nerve axons in PNS
anatomical nerves
what are groups of axons in CNS
tracts
how are PNS axons bound together
connective tissue sheaths
3 sheaths in the PNS axons
epineurium
perineurium
endoneurium
what is the epineurium
outer layer of all neurones
purpose of perineurium
hold facials together
purpose of endoneurium
wrap around individual axons
what do sensory axons join together to form
dorsal root
what do motor axons job to form
ventral root
what is the white matter in the CNS
axons/tracts
what is the grey matter in the CNS
dendrites
cell bodies
synapses
Where do the sensory terminals lie
SC
periphery
where does the cell body of the sensory neurones lie
middle of the two terminals within the dorsal root ganglion
what does the dorsal root ganglion contain
all cell bodies of sensory axons
where do the sensory axons synapse
dorsal horn of SC
where are the cell bodies of motor neurones found
ventral horn of SC
what is the grey matter divided into
ventral and dorsal horn
how do motor neurones move from their origin
motor neurones from ventral horn
axons run through ventral roots to join pheriphal nerves
