Final answer:
The fasciculus gracilis and fasciculus cuneatus are both part of the dorsal column system, carrying sensory information from the body to the brain. The fasciculus gracilis contains axons from the legs and lower body, while the fasciculus cuneatus contains axons from the upper body and arms. Both tracts terminate in the nuclei of the medulla.
Step-by-step explanation:
The fasciculus gracilis and the fasciculus cuneatus are both part of the dorsal column system in the spinal cord. The fasciculus gracilis contains axons from the legs and lower body, while the fasciculus cuneatus contains axons from the upper body and arms. These tracts carry sensory information, such as touch and proprioception, from the body to the brain. The axons in both tracts terminate in the nuclei of the medulla, where they synapse with the second neuron in their respective pathway.