Brainerd, Minnesota. Brainerd is a city in Crow Wing County, Minnesota, United States. Its population was 13,592 as of the 2010 census. It is the county seat of Crow Wing County, and is one of the largest cities in Central Minnesota.
It innervates the back of your tongue to the back of your throat, and helps to control reverse peristalsis. Some people have a glossopharyngeal that innervates a larger part of their tongue than other people, and have a very strong gag when they touch that area.
The uvula. I've always been told, when touched or tugged, it causes one to gag. Also, it produces a lot of saliva, so it is useful when talking, to make sure the mouth doesn't dry out. This link should help. Everything You Need To Know About That Thing Dangling In Your Throat.