Download MBBS Physiology Presentations 16 Cns I Sensory Lecture Notes

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Neuroglia

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? Encapsulated nerve ending ? low threshold

? Free nerve ending ? high threshold

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comparatively

? Slow adapting ? continuous (static) sti

? Fast adapting ? dynamic (change) sti

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? Intensity discrimination ? at receptors

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? Receptive field-


? Mul ers doctrine of specific nerve

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energies

? Labelled line principle

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? Law of projection

Phantom limb

? Weber Fechner law

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? Stevens power law

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Plasticity

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? NCV
? Evoked Potential (upto 100ms)
? Event Related Potential (100-1000ms)
A generator potential

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A. always leads to an action potential.
B. increases in amplitude as a more intense

stimulus is applied.

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C. is an all-or-none phenomenon.
D. is unchanged when a given stimulus is applied

repeatedly over time.

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E. all of the above.

Sensory systems code for the fol owing attributes of

a stimulus:

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A. modality, location, intensity, and duration

B. threshold, receptive field, adaptation, and

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discrimination

C. touch, taste, hearing, and smel

D. threshold, laterality, sensation, and duration

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E. sensitization, discrimination, energy, and

projection
A 28-year-old male was seen by a neurologist

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because he had experienced prolonged episodes

of tingling and numbness in his right arm. He

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underwent a neurological exam to evaluate his

sensory nervous system. Which of the fol owing

receptors is correctly paired with the type of

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stimulus to which it is most apt to respond?

A. Pacinian corpuscle and motion.

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B. Meissner's corpuscle and deep pressure.

C. Merkel cel s and warmth.

D. Ruffini corpuscles and sustained pressure.

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E. Muscle spindle and tension.