BRAIN
CRANIAL NERVES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
About 80% of motor fibers cross or decussate at the level of the medulla.
|
|
TRUE
|
|
|
FALSE
|
|
|
Either A or B
|
|
|
None of the above
|
Explanation:
Detailed explanation-1: -Once it reaches the lower medulla, about 85 to 90% of the fibers will cross over or “decussate” at the pyramidal decussation to form the lateral corticospinal tract (LCST).
Detailed explanation-2: -[1] As the corticospinal tract travels down the brain stem, a majority of its fibers decussate to the contralateral side within the medulla then continues to travel down the spinal cord to provide innervation to the distal extremities and muscle groups.
There is 1 question to complete.