To add to before, you may never again have the chance to take as wide a variety of classes as you can in undergrad. If you have interests outside of science and medicine, or want to develop some, it could be a long time before you have the chance to learn something about art history, architecture, ancient Roman engineering, or whatever else you might find exciting. If it were me, I would (and did at the time) take something like that as a senior, knowing that I'd have the next 4 years in medical school to learn more about anatomy and neuroscience. That said, I was also a neuroscience major, and took plenty of neuro-related classes for the first few years of college. If you have science credits you need to fill anyway, neuroanatomy doesn't sound like a bad choice.