Help with:
If you haven't studied any neuro-anatomy before, here are a few helpful tips and links to help you get to grips with the basics:
D = Down = Descending = In descending pathways the action potentials / neurons travel down through the body from the brain.
Therefore Up = Ascending = In ascending pathways the action potentials / neurons travel up through the body to the brain.
Brain Anatomy Website:
McGill - The brain from top to bottom (Link opens in a new window).