Flashcards in Nerves Deck (50)
Where are ganglion located?
What does the central nervous system consist of?
Brain and Spinal cord
What does the peripheral nervous system consist of?
Everything except brain and spinal cord
What is the cell body called?
What is Nissl substance and where is it located?
Clumps of rER located in the cell body and dendrites
Does the soma have a nucleolus?
What is the background of nervous tissue called?
Do dendrites conduct signals toward or away from the soma?
D axons conduct signals towards or away from soma?
When do axons not transmit information away from the soma?
What cells produce myelin in the central nervous system? Peripheral?
Peripheral: Schwann cells
What are the 3 types of neuron shape?
Bipolar, pseudounipolar, multipolar
What are bipolar neurons used for?
Sight, hearing, smell
What are pseduounipolar nerves used for?
Regular sensory neurons
What are multipolar neurons used for?
Most motor neurons
Where can synapses occur?
Cell body, axons, dendrites
What is bodain classification of neurons?
Dendritic zone (area that is stimulated/inhibited)
Axonic zone (conducting part)
Telodendritic zone (terminal mods that allow for transfer of information at synapse)
What is the bodain classification of a bipolar neuron?
Dendritic zone: Dendrites
Axonic zone: Axon & cell body
Telodendritic zone: End of axon
What is the bodain classification of a pseduounipolar neuron?
Dendritic zone: on lower part of neuron
Axonic zone: Axon, cell body
Telodendritic zone: right above cell body
What is the bodain classification of a multipolar neuron?
Dendritic zone: Dendrites & cell body
Axonic zone: Axon
Telodedritic zone: End of axon
What are the neuroglial cells of the central nervous system?
Astrocytes, Microglia, Oligodendrocytes, Ependymal cells
What are the glial cells of the peripheral nervous system?
Satellite cells (ganglionic gliocytes)
Schwann cells (neurolemmocytes)
What is the purpose of neuroglial cells?
To provide support to the central nervous system because there is little CT
Form scars by proliferating astrocytes after injury
What is an astrocyte?
Largest neuroglial cell
Protoplasmic is found in grey matter
Fibrous is found in white matter (surround nodes of ranvier)
What is the purpose of astrocytes?
Recycle neurotransmitters, maintenance of synapses, maintain the blood-brain barrier, antigen-presenting
What diseases are astrocytes key in?
Alzheimers, ALS, Alexander's disease
Where are oligodendroglia located?
In the CNS
In grey matter near perkarya to produce myelin
In white matter to produce myelin
How many neurons can one oligodendrocyte envelop?
What are ependymal cells?
Line cavity of brain and spinal cord
Contribute to formation of Cerebrospinal fluid
Stem cell properties (proliferate in response to injury, generate neuroblasts and astrocytes)