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39 Cards in this Set

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The contents of this are the nucleus, ribosome, Nissl bodies, Golgi and lots of mitochondria.
Soma
What types of inclusions may be found in neurons?
Lipofuscin
Lewy Bodies
This yellow-brown pigmen is a by-product of lysosomal activity.
Lipofuscin
Lewy Bodies
Small inclusions found in the cytoplasm of injured or dying neurons.
The presence of what is a histological marker of the degenerative changes in Parkinsons disease and other neurological conditions?
Lewy Bodies
Axolemma
the cell membrane of the axon
Axoplasm
The cytoplasm of an axon
Anterograde flow
Soma towards axon
Retrograde flow
Movement up the axon towards the soma.
Most neurons are what type?
Multipolar
What is the function of Multipolar neurons?
Motor
What is the structure of a bipolar neuron?
One axon and one dendrite
Where are bipolar neurons found?
The ganglia of the special senses (sight, hearing, etc)
Motor or Sensory?
Multipolar
Bipolar
Unipolar
Multipolar- motor
Bipolar- sensory
Unipolar- sensory
What is the structure of a unipolar neuron?
Unipolar neurons have one process that extends from the cell body and divides into a central and peripheral branch.
In a unipolar axon, both branches are structurally what?
Axons
What are the four types of Neuroglia?
Oligodendrocytes
Astrocytes
Microglia
Ependymal Cells
Glioma
Collective term for tumors of the NS which generally arise from glial cells since neurons dont divide.
Oligodendrocytes are responsible for ? They are found in the __ matter?
Responsible for CNS myelination.
Found in gray and white matter.
Which can envelop segments of more than one axon? Schwann cells or Oligodendrocytes?
Oligodendrocytes
What are the main functions of astrocytes?
Carrying nutrients from blood
Maintaining ionic conditions
Neuron migration through development
These glial cells are the blood brain barrier police men.
Astrocytes
There are the largest number of what type of glial cells?
Astrocytes
Astrocytes are located in the ___ matter?
grey and white
Phagocytic cells of CNS?
Microglia
Microglia are found in ___ matter? They arise from ___?
grey and white matter
monocytes
Ependymal cells are ____ cells that line the ____?
Ependymal cells are ciliated cells that line the spinal cord and the ventricles of the brain.
These modified glial cells form part of the choroid plexus.
Ependymal cells.
Multiple Sclerosis
primary demyelinating disease. Plaques cause demyelination leading to glial scar tissue and axon degeneration.
When can a Schwann cell associate with multiple neurons?
When they are unmyelinated.
What are the 3 layers of CT sheathing that cover peripheral nerves?
Epineurium
Perineurium
Endoneurium
Blood vessels run in what part of the CT sheath covering peripheral nerves?
Epineurium
This surrounds a bundle of axons (fascicle).
Perineurium
A very fine sheath of reticular fibers that surrounds the individual axons in a peripheral nerve.
Endoneurium
Viruses may travel through this layer of CT surrounding a peripheral nerve.
Endoneurium
Dorsal root ganglion contain what?
The soma of pseudounipolar neurons
Pacinian corpuscles
onion shaped pressure senson found in deep layers of skin.
Meissner's Corpuscles
fine touch receptors. look like a small tornado. more superficial than pacinian corpuscles
Intrafusal fibers/ muscle spindles
receptors that monitor the amount and rate of stretch in a muscle