Flashcards in PNS WI18-Glia Cells Deck (19):
This cell in the CNS is described as an octopi shaped cell due to its processes that wrap around and myelinated several axons.
This cell is the most abundant glial cell. It is star shaped and has structural and physiological functions.
What is the physiological function of astrocytes?
Astrocytes serve in metabolic processes, exchanging ions, as well as nutrients and waste between neurons and interstitial fluid.
What is the structural function of astrocytes?
Astrocytes provide support to hold fibers in place, taking up space between between neurons
What is the function of astrocytes during injury?
They form scar tissue
These cells are ciliated pseudostratified epithelial cells that along with the capillaries form the choroid plexus and produce CSF
T/F: Ependymal cells are thought to be stem cells due to recent success growing neurons
These glial cells are considered the immune system cell of the nervous system. They have phagocytic function.
When a neuron is under stress what occurs?
1. Neuron sends out a distress signal
2. Microglia appear and transform
3. Microglia engulf and digest antigens
4. Distress signal stops and neuron returns to normal.
This glial cell myelinate one aspect of the axon multiple times with a phospholipid membrane, facilitates regrow Th of axons and helps regulates neuron metabolism.
Schwann cell (PNS)
What is unique about the node of ranvier in terms of signal conduction
The node of ranvier allows for signal to skip and go faster.
The difference in spacing controls the speed of conduction
This glial cell is a flatten schwann cells, located around pseudounipolar neurons.
They are thought to have the Same function as astrocytes.
They are only located in the peripheral nervous system
Defects in the myelination of axons leads to?
Loss of reflex
Definition: Progressive e degenerative disease of the brain found in people(typically athletes) with repetitive trauma to the head
Chronic traumatic encephalopathy
Multiple sclerosis affects which nervous system?
Central nervous system (typically affects women)
This disorder is idiopathic although it seems to be ignited by previous infection. Believed to be immunological
Typically affects men and PNS.
Has symptoms of progressive motor weakness, sensory loss, and areflexia
23% of all brain tumors are _______
Astrocytomas (due to abundance)
8% of brain tumors are accounted for by
Ependymal cell =ependyomas