In vertebrates, the neurons in the midbrain control body activity, especially those required for locomotion. Command neurons are produced in this region of the brain and transferred directly to the brainstem. From there, they go through the medulla to the local networks that control the activity of the body's musculature. While much has been known about the initiation and maintenance mechanisms of activity for some time now, with regard to the stopping of activity there was only the assumption that the result of the termination of activity was from brainstem neurons. Researchers have now discovered a cell population in the brainstems of mice, which causes the end of a movement sequence.