Biology I - Nervous System - Somatosensation of the Peripheral Nervous System

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8 Terms

1
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Q: Why are proprioception and vibration signals transmitted faster than pain or temperature?

A: They travel on large, myelinated axons; pain/temperature use small or unmyelinated ones.

2
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Q: A patient can't feel vibration but can feel pain. Which somatosensory pathway is likely damaged?

A: The large, myelinated mechanoreceptor pathway.

3
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Q: How does axon structure affect somatosensory signal speed?

A: Larger diameter and thicker myelin increase conduction velocity.

4
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Q: Which receptors use bare nerve endings and why is this significant?

A: Nociceptors and thermoreceptors. allows direct response to damaging stimuli.

5
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Q: How do mechanoreceptor end structures support function?

A: Specialized endings enhance detection of pressure, vibration, and stretch.

6
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Q: Which sensory modalities rely on mechanoreceptors?

A: Position sense, vibration, and touch.

7
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Q: A burn damages superficial mechanoreceptors. Which sensation remains intact?

A: Deep pressure or proprioception, detected by deeper mechanoreceptors.

8
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Q: Where are somatosensory neuron cell bodies located?

A: In ganglia near the spinal cord or brainstem.