The defensive line consists of one or two defensive tackles and two defensive ends who play outside the defensive tackles. The defensive line works with the linebackers to try to control the line of scrimmage. The 4-3 defense, most commonly used in the NFL, employs two defensive tackles (and a defensive line of four men, with three linebackers behind them), while the 3-4 defense uses just a single defensive tackle, called the nose tackle (and a defensive line of three men, with four linebackers behind them). However, defensive ends in a typical 3-4 have responsibilities more similar to a 4-3 defensive tackle than 4-3 defensive ends.