A turbine airfoil usable in a turbine engine and having at least one cooling system. At least a portion of the cooling system may be positioned in an outer wall of the turbine airfoil for receiving cooling fluids from a cooling fluid supply source, passing those fluids through the chambers in the outer wall, and exhausting those fluids into central cooling fluids collection chambers. The outer wall may include a plurality of outer wall cooling chambers that may be configured to pass cooling fluids in a counter flow direction. The outer wall cooling chambers may include a plurality of ribs including a plurality of impingement orifices for increasing the cooling efficiency of the cooling system.