The fifth in our seven-part series for Yahoo! SportsThese days in the National Football League, there's so much emphasis placed on the performance of the quarterback that you wonder if he's the only player on the field.And while the offense may be the main focus for many fans these days, a team is not going very far without a solid defense.

 So here's the fifth of many looks at the other positions on the field and their importance. In this instance, we'll be focusing on the top defensive linemen in the league. For as many quarterbacks as there are in the league, there are more defenders looking to stop them from doing what they do.

Here are a few...http://sports.yahoo.com/news/nfl-defensive-linemen-driven-league-145700301.html