Descending tracts are pathways in the nervous system that carry signals from the brain to the spinal cord and peripheral muscles. These tracts are essential for voluntary movements, as they transmit motor commands that control muscle contractions and coordination. There are several types of descending tracts, including the corticospinal tract, which is crucial for fine motor skills, and the reticulospinal tract, which helps regulate posture and balance. These tracts ensure that the brain can effectively communicate with the body, allowing for smooth and coordinated movements.