12.1 Cell surface, a complex structural and functional system 1. Cell surface: Glycocalyx--cell coat and extracellular surface adherent materials Cytoplasmic membrane Gel layer underneath membrane Specialising structure of cell surface Cell junction12.1 Cell surface, a complex structural and functional system 1. Cell surface: Glycocalyx—cell coat and extracellular surface adherent materials Cytoplasmic membrane Gel layer underneath membrane Specialising structure of cell surface Cell junction