An intramedullary nail and targeting and/or nailing instrument are provided, whereby a connection end of the targeting and/or nailing instrument has an axially parallel protrusion and a connection end of the nail has an axially parallel recess in order to couple the targeting and/or nailing instrument. The coupling system couples the targeting/nailing instrument and nail in their rotational position when they contact axially and whereby a connector is also provided in order to connect the targeting and/or nailing instrument and the nail in an axially fixed but also releasable manner. The connection end of the targeting and/or nailing instrument has an end section that engages approximately in one end of the bore-hole section of the nail and the end section and bore-hole section have a deformable element for a releasable snap connection of the parts with the simultaneous contact of the axially parallel protrusion and the axially parallel recess.
