Question
Tests for graphesthesia and stereognosis are used clinically to assess:
| A. |
Cortical sensation
|
| B. |
Posterior column
|
| C. |
Cerebellar function
|
| D. |
Lateral spinothalamic tract
|
Show Answer
|
Correct Answer � A
Explanation
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|
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Graphesthesia and stereognosis:
- These tests evaluate the brain’s ability to interpret sensory input received via peripheral nerves.
- Graphesthesia: The ability to recognize writing on the skin by touch.
- Stereognosis: The ability to identify objects placed in the hand by touch.
- Both require intact cortical sensory processing, particularly in the parietal lobe.
-
Posterior column:
- Incorrect. The posterior column mediates proprioception and vibration but does not process higher-level cortical sensory functions like graphesthesia or stereognosis.
-
Cerebellar function:
- Incorrect. The cerebellum coordinates movement and balance but is not involved in cortical sensory processing.
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Lateral spinothalamic tract:
- Incorrect. This tract carries pain and temperature sensations but does not process cortical sensory input.
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