There’s a great video on this page showing the affect of hitting a couple of pressure points. I’d love to be that accurate at striking them!
http://kyusho-canada-blog.com/?p=901
From the site –
“The master of old knew things and did things we could only dream of, but this knowledge came from repetition. Men like Funakoshi and Oyata were men of a different era of the arts. Back in those days you would train on a single kata for years on end.”