Nervous Tissue Flashcards
Cell bodies/soma of neurons are also known as what?
Perikaryon
Where are pyramidal cells predominantly found?
the pyramidal layer.
Where are the cell bodies of neurons and glial cells in the cerebral cortex?
The gray matter
The axons entering and exiting the cerebral cortex are found where?
white matter.
What are the three layers of the cerebellum?
outer- molecular layer
intermediate- purkinje cell layer
inner- granular layer.
Note: Be aware that white matter might stain darker than gray matter sometimes. don’t use this as a rule of thumb when deciding what is gray matter and what is white matter.
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where are the cell bodies of motor neurons?
The cell bodies are in the spinal cord, but these are still PNS!
Do sensory neurons have dendrites?
What is their neuron type called? What about embryonically?
Where will their cell bodies be found?
No dendrites.
Pseudounipolar, meaning axon splits in two separate directions. embryonically, they were bipolar neurons
Cell bodies found in dorsal root ganglion
Where are fibrous astrocytes found? What do they do?
Found mostly in brain white matter. have processes that induce formation of blood brain barrier
protoplasmic astrocytes found where? Do what?
gray brain matter. have processes to induce formation of blood brain barrier.
tannycytes are also known as?
ependymal cells.
What do microglia do? What happens to them?
macrophages that enter CNS during development. Phagocytyze injured tissue. After engulfing enough, they lose that function and become gitter cells.
CNS neuroglia all come from what? what is the exception?
They are all derived from the neuroectoderm, except the microglia that come from HSC of bone marrow
Where are satellite cells find? What do they do?
Found in the ganglia of PNS. Assist in regeneration following peripheral nerve injury
PNS structures (schwann cells, satellite cells, ganglion neurons) are all derived from what?
neural crest.
