1.stroma of the nervous system->neuroglial cells (glia=glue)
2.Parenchyma of the nervous system->neurons (the functional cells)
what does the neuroglial cells provide & what is it a common source of?
a. they provide physical and/or metabolic support for the functional cells
b.they are a common source of nervous system tumors->gliomas
what parenchyma of the nervous system->neurons?
the functional cells
what are the 4 types of neuroglial cells in the CNS?
1.Astrocytes
2.Oligodendrocytes
3.Ependyma Cells
4. Microglial cells
what is the 1 type of neuroglial cell in the periheral nervous system(PNS)?
schwann cells
which neuroglial cell in the CNS is star shaped cells with numerous "processes"
astrocytes
which neuroglial cells in the CNS have some processes that wrap around (twine) adjacent neurons providing physical support?
astocytes
which neuroglial cells in the CNS have some processes that wrap around adjacent capillaries->which provides metabolic support?
astrocytes
why do astrocytes have some processes wrap around adjacent capillaries?
it creates a pathway for the exchange of nutrients and wastes through the astrocyte.
when astrocytes processes wrap around adjacent capillaries creating a pathway for the exchange of nutrients and waste through the astrocyte the neuron is not in direct contact with the blood vessel so in par is responsible for what?
"blood-brain barrier"
(astrocyte) when a neuron is not in direct contact with the blood vessel and is in part is responsible for "blood-brain barrier" what does it isolate?
it isolates brain neurons from bloodstream
(astrocyte)what happens when the brain neurons are isolated from blood stream?
a.minimizes chances for infection
b.difficult to treat a CNS infection because it is isolated from immune system
(astrocytes) what would happen if blood-brain barrier should fail
auto immune disease
which neuroglial cells in the CNS have a star shaped cells w/fewer processes than astrocytes?
oligodendrocytes
which neuroglial cells in the CNS form semi-rigid connective tissue rows->providing physical support?
oligodendrocytes
which neuroglial cells in the CNS has a process that can wrap around a neuron multiple times forming a "myolin sheath"?
oligodendrocytes
when an oligodendrocytes process wraps around a neuron multiple times forming a myolin sheath what does a lipid covering it do?
a lipid covering that insulates the neuron electrically
which neuroglial cells in the CNS has small cells-> similar to epithelial cells->vary in shape from squamous to columnar?
ependyma cells
which neuroglial cells in the CNS form continuous sheets that line fluid filled spaces inside the CNS->ventricles and canals(filled with cerebrospinal fluid)(CSP)?
ependyma cells
when ependyma cells form continuous sheets that line fluid filled spaces inside the CNS->ventricles and canals(filled with cerebrospinal fluid)(CSP) what does it provide to the adjacent neurons?
it provides physical support for the adjacent neurons
what does it mean that many ependyma cells are ciliated
they play a role in circulation of verebrospinal fluid
which neuroglial cells in the CNS has small cells with few processes-> but the processes are highly branched?
microglial cells
which neuroglial cells in the CNS are normally stationary->but migrate to the site of tissue injury in response to chemical signals?
microglial cells
which neuroglial cells in the CNS have phagocytic cells that engulf microbe and cellular debris just white blood cells(may be derived from monocytes)?
microglial cells
(microglial cells) what is a critical function since the CNS is isolated from the immune system?
phagocytic cells->engulf microbes and cellular debris just white blood cells( may be derived from monocytes)
which neuroglial cells in the CNS often wrap around neurons producing 2 layers?
schwann cells
what are the two layers produced by the schwann cells after they wrap around neurons?
inner & outter layer
what is the inner layer of a schwann cell that is produced after they wrap around neurons?
white, lipid segmented covering->myelin sheath( insulate the neuron-dectrically)
what is the outter layer of a schwann cell that is produced after they wrap around neurons?
cytoplasm & schwann cell organelles-> neurolemma
what neuroglial cells in the CNS is this representing?
astrocytes
what neuroglial cells in the CNS is this representing?
oligodendrocytes
what neuroglial cells in the CNS is this representing
oligodendrocytes
a. what does each segment represent?
b.what is b?
a.each segment represents one schwann cell
b.unmyelinated gaps between the schwann cells->Nodes of Ranvier
what does the schwann cell do developmentally?
it elongates and grows around neuron producing multiple layers of cell membrane-> the myelin sheath
wjat does the schwann cell wrap around?
the neuron process
a.myelin sheath
b.neurolemma->cytoplasm and organelles of schwann cell
c.oligediocyte
d.myelin sheath
f.CNS
g.PNS
what two roles does the neurolemma play in regeneration of neurons?
1. provides a mold for rebuilding the damaged neuron
2. provides metabolic support for the repair
what happens is a neuron is destroyed, it is lost and not replaced?
no mitotic ability
if the neuron cell body is intact-> the damage will reapair only if...
and will the neurons in the PNS or CNS reapair?