Supportive Cells Flashcards
neuroglia are cells that perform various
supportive and protective roles for the neurons
oligodendrocytes are found where?
CNS
oligodendrocytes resemble
an octopus because it has 15 arms
oligodendrocyte arms reach out and wrap around a nerve fiber
like electrical tape on a wire
oligodendrocytes wrapping around a fiber creates
a myelin sheath
myelin sheath
insulates the nerve fiber from the ECF and speeds up signals conduction in the nerve fiber
ependymal is found where?
CNS
ependymal resemble
cuboidal epithelium
ependymal lines the
internal cavities of the CNS
does ependymal have a basement membrane?
no
ependymal exhibits what kind of process that penetrate the underlying tissue
rootlike
ependymal produces what?
cerebral spinal fluid(CSF)
microglia are found where?
CNS
microglia has what kind of process?
long thorny
what do microglia processes touch?
nearby neurons
microglia play what type of role?
protective
astrocytes are found where?
CNS
astrocytes are the most
abundant
astrocytes are what type of cell?
branching
astrocytes radiating processes cling to what?
neurons, their synapses, and capillaries
astrocytes form
blood-brain barrier
astrocytes regulate blood flow between
neurons and its capillaries
astrocytes recapture
neurotransmitters
astrocytes have structural
support
schwann cells are found in the
PNS
schwann cells surround
large nerve fibers
schwann cells form
myelin sheaths
satellite cells are found in the
PNS
satellite cells surround
neuron cell bodies
the function of satellite cells
is unknown
myelinated fibers conduct
nerve impulses rapidly
unmyelinated fibers conduct
impulses slowly
dendrites are always
uninsulated
what makes up the neurilemma
schwann cell external membrance
large fibers have more surface area and conduct signals______________ than small fibers
more rapidly