3 NFL QBs sidelined by concussions on 1 day - Article Photos 5/6

San Francisco 49ers quarterback Alex Smith slowly gets up after being hit during the first quarter of an NFL football game against the St. Louis Rams in San Francisco, Sunday, Nov. 11, 2012. In the background is San Francisco 49ers tackle Anthony Davis. Smith later left the game. (AP Photo/Jeff Chiu)