The invention relates to a method and an arrangement for winding a winding wire onto a winding body, and to an associated magnet assembly. The start of the winding wire is threaded into a first wire-receiving slot of a first electrical connection dome. By a winding operation a predefinable number of turns are then wound onto the winding body, and one end of the winding wire is threaded into a second wire-receiving slot of a second electrical connection dome and cut off. According to the invention, the start of the winding wire which has been threaded into the first wire-receiving slot is placed on a first wire support which is arranged downstream of the first wire-receiving slot. The winding wire is shaped and held before the winding operation such that the diameter of the winding wire is increased at one region positioned on the first wire support, in the direction of the width of the first wire-receiving slot, and the start of the winding wire is prevented from slipping back into the first wire-receiving slot.