An inner organ for a vehicle, including a retractable shelf, extending between a free end and an end for connecting to a movement mechanism, and deployable between a retracted position and a deployed position. The movement mechanism includes: at least one first rail, extending between a lower end and an upper end; for each first rail, a cursor movable along this first rail, and coupled to the connecting end of the shelf; and an element for blocking the shelf in the deployed position. The blocking element is connected to the connecting end of the shelf by a pivot link, is movable along a second rail, and cooperates in the deployed position with a wall arranged at the connecting end of the shelf.