An adjustable position limb support for surgical tables consisting of a support arm pivotally mounted at one end to a base which is attachable to the table and an externally powered position actuator pivotally mounted to the support arm and the base at positions spaced apart from the support arm pivot. Heater structures are formed over an array of electrical nodes, and phase change material is formed across the heater structures. The registering is registering first information related to the first image. The output cable of the microphone can be positioned at a horizontal extracted position where the cable is horizontally extracted in parallel to the placed surface and at a vertical extracted position where the cable is vertically extracted relating to the placed surface.