Body Panel Name

I have a 1993 Nissan Sentra 1.6L 4dr with a trunk that is starting to rust out. The trunk itself seems to be one solid piece, except for the wheel wells. The wheel wells (which contain the strut mounts and all the rust) are a seperate piece that is spot welded to the rest of the trunk and sealed with some sort of RTV sillicone. Does anyone know what this panel is called?

Inner wheel well.