go here

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?holding=npg&cmd=Retrieve&db=PubMed&list_uids=7630893&dopt=Abstract

and here:

http://cancerweb.ncl.ac.uk/cgi-bin/omd?query=medial+lemniscus&action=Search+OMD
(this one is what I learned in class today)