The invention relates to an operative assistance system (1) for a magnetic resonance tomograph (I) for displaying an entry point (IX) for an instrument on the surface of a patient (VIII), comprising at least one device (3) having at least one first holder (IV) for accommodating at least one conductor loop (III), and having a second holder (V) for accommodating at least one luminous means (II) for displaying predefinable coordinates of the entry point (IX)).