Question

a lesion compressing corticospinal tracts above the decussation will cause: ipsilateral weakness contralateral weakness bilateral weakness no weakness

Explanation:

The corticospinal tracts decussate (cross - over) at the medullary pyramids. A lesion above the decussation affects the same - side (ipsilateral) motor function as the corticospinal tracts have not yet crossed over.

Answer:

A. Ipsilateral weakness