Final answer:
The fiber tracts that run between the dorsal horns of the spinal cord are called commissural tracts. These tracts are part of the white matter, allowing communication between the two sides of the spinal cord, and are distinct from ascending tracts of sensory information and descending tracts for motor control. The correct option is D) Commissural tracts
Step-by-step explanation:
The fiber tracts that run between the dorsal horns are known as commissural tracts. These tracts are part of the white matter of the spinal cord, which is separated into columns. The posterior columns, or dorsal columns, are situated between the two posterior horns of gray matter and are composed of axons of ascending tracts that carry sensory information up to the brain from the periphery.
The commissural tracts allow for communication between the two sides of the spinal cord. In contrast, the corticospinal tracts are descending tracts involved in the control of skeletal muscle movements, and ascending tracts are generally associated with the dorsal column and spinothalamic pathways conveying sensory information to the brain. The correct option is D) Commissural tracts