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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.
Q: A patient can't feel vibration but can feel pain. Which somatosensory pathway is likely damaged?
A: The large, myelinated mechanoreceptor pathway.
Q: How does axon structure affect somatosensory signal speed?
A: Larger diameter and thicker myelin increase conduction velocity.
Q: Which receptors use bare nerve endings and why is this significant?
A: Nociceptors and thermoreceptors. allows direct response to damaging stimuli.
Q: How do mechanoreceptor end structures support function?
A: Specialized endings enhance detection of pressure, vibration, and stretch.
Q: Which sensory modalities rely on mechanoreceptors?
A: Position sense, vibration, and touch.
Q: A burn damages superficial mechanoreceptors. Which sensation remains intact?
A: Deep pressure or proprioception, detected by deeper mechanoreceptors.
Q: Where are somatosensory neuron cell bodies located?
A: In ganglia near the spinal cord or brainstem.