I should perhaps take a course in biology. Jeanette, I believe you are right because, I recall the name of subtantia nigra applied to that part of the brain, period...not to a limited section of people with certain diseases, but to any brain, healthy or not. Michel Leo Fuhr wrote: > I thought the substania nigra part of the non-diseased human brain is so > called because it appears dark compared to other portions of the brain. > This "darkness" would then be normal, not disease caused. If this is > WRONG, I hope someone like Dr. Bob F.or Joe Bruman or Michel Margosis who > are trained in the sciences will speak up.