The nerve fibers that originate in the cerebral cortex and control movement cross the midline just above the junction of the medulla and spinal cord.As a result,these fibers provide input to _________ structures of the body,or structures that are on the _________ side of the midline as the cortical cells providing their motor input.
A)ipsilateral; same
B)contralateral; opposite
C)ipsilateral; opposite
D)contralateral; same

Question

The nerve fibers that originate in the cerebral cortex and control movement cross the midline just above the junction of the medulla and spinal cord.As a result,these fibers provide input to _________ structures of the body,or structures that are on the _________ side of the midline as the cortical cells providing their motor input.​ 
A)ipsilateral; same 
B)contralateral; opposite 
C)ipsilateral; opposite 
D)contralateral; same

Quizplus · Accepted Answer

The nerve fibers cross the midline just above the junction of the medulla and spinal cord, which means that they provide input to structures on the opposite side of the midline as the cortical cells providing their motor input. Therefore, the answer is contralateral and opposite, which is represented by choice B.

The Nerve Fibers That Originate in the Cerebral Cortex and Control