Armrest with movable centerpiece

A side impact system for a vehicle includes an end plate and a Armstutzenkern, which is supported by the covering part. The Armstutzenkern translationally relatively movable from a supporting position to an extended position below the supporting position to the trim part. An actuator is connected to the Armstutzenkern for moving the Armstutzenkerns from the supporting position to the extended position. In the supporting position of the Armstutzenkern may be adjacent to an occupant and ribs in the extended position of the Armstutzenkern may be adjacent to the hips of the occupant. The actuator can move the Armstutzenkern to the extended position, during a side impact of the vehicle to reduce the likelihood that the Armstutzenkern is pressed into the ribs of the occupant.