You find the following:
SpoilerIn regards to the medical procedures - You find absolutely nothing on the subject. Almost every single book you can get your hands on in regards to "medical procedures" have to do with the healing properties of magic and how magic has come to substitute the very old practice of actual natural medicine in Netheril. The only borderline natural medical practice is that of first aid, and even that has been proven to be outdone by anyone who has even the smallest amount of medical talent.
In regards to Humanoid brains - You find nothing that would suggest work has been done on extracting or surgical procedures of the brain. Again, most focus on mind control magics and how those can alter a person.
In regards to Elves - As far as you can tell, there has been no true "war" between humans and elves... Though there has been some long standing distrust between the two races for many millennia.