2,179 views
Change Player Size
Watch this video in a new window
NFL Concussion - how to prevent concussions-Mouth guards
Concussions are likely to occur when the jaw is impacted. The bone that connects to the lower skull is the upper jaw. The area where the skull and jaw articulate is a highly sensitive nexus of the ...
Upgrade to Flash Player 10 for improved playback performance. Upgrade Now or get more info.
0 ratings
Sign in to rate
748 views
© 2009 YouTube, LLC