Ascending tracts are pathways in the nervous system that carry sensory information from the body to the brain. These tracts are part of the central nervous system and help transmit signals related to touch, pain, temperature, and proprioception, allowing the brain to process and respond to various stimuli. The main ascending tracts include the spinothalamic tract, which conveys pain and temperature sensations, and the dorsal columns, which transmit fine touch and proprioceptive information. Understanding these tracts is essential for studying how the body perceives and reacts to its environment.