PNS WI18-Glia Cells Flashcards Preview

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Flashcards in PNS WI18-Glia Cells Deck (19):
1

This cell in the CNS is described as an octopi shaped cell due to its processes that wrap around and myelinated several axons.

Oligodendrocytes

2

This cell is the most abundant glial cell. It is star shaped and has structural and physiological functions.

Astrocytes

3

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.

4

What is the structural function of astrocytes?

Astrocytes provide support to hold fibers in place, taking up space between between neurons

5

What is the function of astrocytes during injury?

They form scar tissue

6

These cells are ciliated pseudostratified epithelial cells that along with the capillaries form the choroid plexus and produce CSF

Ependymal cell

7

T/F: Ependymal cells are thought to be stem cells due to recent success growing neurons

True

8

These glial cells are considered the immune system cell of the nervous system. They have phagocytic function.

Microglia

9

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.

10

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)

11

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

12

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

Satelite cells

13

Defects in the myelination of axons leads to?

Autoimmune

Weakness

Loss of reflex

Numb feeling

14

Definition: Progressive e degenerative disease of the brain found in people(typically athletes) with repetitive trauma to the head

Chronic traumatic encephalopathy

15

Multiple sclerosis affects which nervous system?

Central nervous system (typically affects women)

16

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

Guillain-Barré syndrome

17

23% of all brain tumors are _______

Astrocytomas (due to abundance)

18

8% of brain tumors are accounted for by

Ependymal cell =ependyomas

19

3% of all brain tumors are accounted for by_______

Oligodendrogliomas