Question
Corticospinal tract crosses at?
| A. |
Midbrain
|
| B. |
Pons
|
| C. |
Upper medulla
|
| D. |
Lower medulla
|
Show Answer
|
Correct Answer � D
Explanation
|
|
The majority of the fibers in the corticospinal tract, which is responsible for motor control, decussate (cross over) at the level of the lower medulla in an area known as the pyramidal decussation.
This crossing is a crucial aspect of the neuroanatomy of the motor pathway, as it explains why each side of the brain controls the opposite side of the body.
After crossing, the fibers continue down the spinal cord in the lateral corticospinal tract, which forms the primary pathway for conveying voluntary motor impulses to the body’s muscles.
