A recent study has functionally disentangled the hitherto enigmatic mesencephalic locomotor region of the brain on the basis of cell type diversity and identified differential upstream regulatory pathways.
Esposito, M. S., & Arber, S. (2016, April 4). Motor Control: Illuminating an Enigmatic Midbrain Locomotor Center. Current Biology. Cell Press. https://doi.org/10.1016/j.cub.2016.02.043