FWIW:
“The cell membrane or plasma membrane is a biological membrane that separates the interior of all cells from the outside environment.”
http://en.wikipedia.org/wiki/Cell_Membrane
Wikipedia had no entry for plasma membrane. If the presser used cytoplasm, it would have been correct, but a cell's plasma is misleading. Plasma is extracellular. Intracellular fluid can be referred to as cytoplasm or cytosol.