Final answer:
The dorsal column system carries touch and proprioception information and crosses in the medulla, while the spinothalamic tract carries pain and temperature sensation and crosses in the spinal cord.
Step-by-step explanation:
The dorsal column system primarily carries information about touch and proprioception and crosses the midline in the medulla. The spinothalamic tract is primarily responsible for pain and temperature sensation and crosses the midline in the spinal cord at the level at which it enters.