The invention relates to a support arm profile for a support arm system, comprising a receiving space for cables or the like which is open toward the surroundings, wherein a connecting element is molded inside the support arm cross-section and is connected indirectly or directly to two opposite side walls of the profiled support element. In such a support profile, high profile stiffness, which meets all the requirements of a support arm system, can be achieved in that two delimiting elements are connected, spaced apart, to the connecting element, and that the delimiting elements extend from the connecting element at an angle to the side walls.