The present invention relates to an auxiliary Magnetic Stimulation (MS) coil arrangement and system, applicable particularly but not exclusively to Transcranial Magnetic Stimulation (TMS) arrangements. The invention provides an auxiliary MS coil arrangement for external magnetic stimulation of a body configured for cooperation with a primary MS coil winding. The auxiliary MS coil arrangement comprises an elongate conductive element formed of a current collecting portion for positioning in the magnetic field produced by a primary MS coil winding, a head portion comprising a magnetic stimulation winding having one or more turns, and a bridge portion extending between the current collecting portion and the head portion for enabling current flow from the current collecting portion to the head portion.
