robin082006
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In a classic experiment performed by Sherrington in the cat, marked rigidity was demonstrated in a decerebrate preparation. Similarly, an 80-year-old woman displayed rigidity, which resembled that shown in the cat after having a stroke.
The likely location of the stroke is in the
a. Thalamus
b. Hypothalamus
c. Upper midbrain
d. Pons
e. Spinal cord
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| mitty
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?A
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| vanshita
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E?
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| Bartek
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My choice is: D
"Lesions above the pontine reticular formation but below midbrain cause decerebrate rigidity" (somewhere in Costanzo BRS Physiology
Reticular formation in pons inhibits alpha and gamma motoneurons.
Destroyed -> excitation of these neurons -> rigidity
for E we have paraplegia below the lesion, after 'spinal shock' (no reflexes)
for A ('m not sure of it) we have lesion of comunication between basal ganglia (controlling movements) and cortex - I expect other symptoms including huntington-like or parkinson-like
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| robin082006
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Excellent Bartek,
Answer is D
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| tolito
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yes D.
lesions above mid brain give decorticate rigidity
whiel lesions below midbrain give decerebrate rigidity
i think this is kaplan info or HY.
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