robin082006
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[left]48. A brain MRI scan taken from a 6-month-old baby revealed that while the overall size of the cerebral cortex was normal, the size of the pyramidal tracts was considerably smaller than normal. The most likely explanation for this defect is that there is a
a. Reduction in the numbers of cortical neurons giving rise to pyramidal tract fibers
b. Reduction in the numbers of synaptic contacts made by pyramidal tract neurons
c. Reduction in the extent of myelin found on pyramidal tract neurons
d. Reduction in the amount of neurotransmitter released by pyramidal tract neurons
e. Reduction in the numbers of glial cells attached to pyramidal tract neurons
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| vanshita
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B?
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| tolito
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A 
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| sonaliraj99
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a???
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| robin082006
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| tolito
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robin, be a good boy and answer the questions.
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| robin082006
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 try again
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| vanshita
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C?
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| tolito
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E
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| robin082006
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answer is C
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| vanshita
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robin can you please explain
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| aisha2
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C
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| yasmeen
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ITS C.MYELINATION OF CORTICOSPINAL TRACTS COMPLETES AT 3 YEARS OF AGETHATS WHY U CAN GET POSITIVE BABINISKIS TEST IN CHILDREN
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| tolito
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yes yasmeen.  the myelinated pathways include
corticospinal tracts
MRF
dorsal column
cerebellar connections to brain stem, dorsal column and spino cerebellar tracts
myelinated nerve == optic nerve.
these may be affected by MS.
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| fox
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good one!
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| waqastariq
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its ..... Krabbe's disease - a leukodystrophy characterized by myelin and oligodendrocyte loss in CNS due to autosomal recessive galactosylceramidase deficiency.
Motor symptoms dominate appearin at 3-6 months of age...fatality around 2 years of age.
it's gotto be C: myelin or may be E: glia.
So i chose C in the end.
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| bangledoc
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A is the right answer
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| docarchana
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can someone plz explain this q???
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