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Homunculus

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Topic updated on 11/07/16 9:13am

Snapshot
  • A 67-year-old man is brought to the emergency department due to dysarthria and right-sided facial and arm weakness. These symptoms occured approximately 2 hours ago. Pertinent past medical history include hypertension, diabetes, and migraine headaches. Head CT is negative for bleeding. Appropriate medication is initiated.
Overview
  • Topographical cerebral cortex representation of sensory and motor areas 
    • more sensitive areas receive a greater representation in the sensory homunculus
    • more precise muscles receive a greater representation in the motor homunculus
Clinical Correlate
  • Lesions affecting certain areas of the primary motor and somatosensory cortex → contralateral spastic paresis and hemihypesthesia, respectively
    • eg, stroke involving the anterior cerebral artery
      • contralateral muscle weakness and sensory loss of the lower limb

 



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