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19 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What are the 5 characteristics of neurons? |
1. Excitability 2. Conductivity 3. Secretion 4. Extreme longevity 5. Amitotic |
"Every Cell Seems Extremely Amped" |
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In this context, how can we define excitability? |
Responsiveness to a stimulus |
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List some examples of stimulus |
Chemical, stretch, pressure changes that change resting membrane potential |
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In this context, how can we define conductivity? |
The ability to propagate an electrical signal |
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In this context, how can we define secretion? |
The release of neurotransmktter in response to conductive activity. |
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In this context, how can we define extreme longevity? |
Cells live a lifetime |
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In this context, how can we define amitotic? |
Adult neurons do not divide |
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What arr examples of neurons that do not meet the amitotic rule? |
Neurons of the olfactory epithelium, and in certain parts of the brain |
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What is the difference between a nerve and a tract? |
Nerve = a group of axons outside the CNS (in the PNS) Tract = Bundes of axons in the CNS that share a common origin and destination |
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What are the important connective tissue wrapings of a nerve? |
-epineurium - perineurium - endoneurium |
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What is the epineurium made of and where is it found? |
Dense irregular CT and encloses the entire nerve. |
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What is the perineurium made of and where is it found? |
Dense irregular CT that wraps fasicles (bundles of axons). |
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What does the perineurium do? |
Supportd blood vessels |
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What is the endoneurium made of and where is it found? |
Made of areolar connective tissue, the endoneurium wraps individual axons |
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Where can yoy find capillaries in a neuron? |
In thr endoneurium |
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What are the functional classifications of nerves? |
-sensory -motor -mixed |
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What does a sensory nerve do? |
Relays info to the CNS |
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What does a motor neuron do? |
Relay info from the CNS |
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What does a mixed nerve do? |
Relay information both to and from the CNS |
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