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Neuroanatomy

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Question 11 mark

A patient has a lesion of the right lateral corticospinal tract at T10. Which motor finding is most likely?

The corticospinal fibres have already crossed at the pyramidal decussation in the caudal medulla. A right lateral tract lesion in the spinal cord therefore causes right-sided upper motor neuron weakness below the lesion. Left-sided weakness would suggest a lesion above the decussation.

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