== Diagram == 

 The articles amyotrophic lateral sclerosis, motor neurone disease, primary lateral sclerosis, and progressive muscular atrophy need a diagram illustrating the upper and lower motor neurone tracts. Ideally I'd like to use this  which is something I use frequently (I adapted it from this which is what I'd really like to use but I don't know where it originated from. Anyway, if anyone can source the copyright or help me make an original version it'd be very helpful, thanks.