Inflammation occurs in the brain all the time.

The inflammation from a trauma would involve the nerve damage itself.

This is done by inflammatory cytokines of the Cox-2 series being released in response to the trauma trigger.

Here is a link a poster on PN found that shows diagrams and pictures of nerve damage. If focuses on peripheral nerves, because that is where most of the research is, but it diagrams how the injuries can involve inflammation.
http://www.georgiapainphysicians.com...od2_slides.htm

Under the subheadings of inflammatory response and peripheral sensitization, these chemical cytokines are listed there.

There are drugs in the pipeline called ampykines, which block glutamate release in certain central brain disorders, and these may prove useful for brain injured patients as well. I believe they are not yet available for general use yet.

Because glutamate is inferred to be the largest problem released by damaged neurons, it would be prudent to avoid all MSG in your diet and food choices. MSG is very hard on the nervous system.