12. A cerebrospinal nerve tract is an example of a(n) A. Ascending nerve tract that carries sensory information
13. If a patient has numbness in her left hand, you are concerned with A. Ascending nerve tracts
14. Association nerve tracts B. Connect the two sides of the nervous system together
15. Commissural nerve tracts B. Connect the two sides of the nervous system together
Step-by-step explanation:
12. Cerebrospinal nerve tracts like the spinothalamic tract are ascending tracts that carry sensory information from the body to the brain.
13. Numbness and loss of sensation are symptoms of damage to ascending sensory pathways.
14. Association tracts connect different regions within the same side of the central nervous system.
15. Commissural tracts cross the midline and connect the two hemispheres of the brain or two sides of the spinal cord. Examples include the corpus callosum and the anterior commissure.
So in summary:
- Ascending tracts carry sensory information
- Descending tracts carry motor information
- Association tracts connect within the same side
- Commissural tracts connect the two sides
Numbness indicates ascending sensory tract dysfunction.