A support arm having a proximate support arm segment, a distal support arm segment, a hinge system; and at least one rotation limit stop secured to the hinge system to limit the extent of angular motion of the proximate support arm segment, the distal support arm segment or both, with respect to the hinge system. The rotation limit stop includes a first stop component and a second stop component slidable with respect to the first stop component. When the second stop component encounters a contact point on one of the support arm segments, the angular motion of the arm segment with respect to the hinge system is at a maximum. The second stop component can be secured in a plurality of positions with respect to the first stop component by an adjustment component.