Abstract: In one aspect, a micro-fluidic system consisting of modules that are arranged side by side in a row, each module containing a micro-fluidic unit and an associated electric control unit is provided. The rear faces of the modules lie against a common vertical rear wall unit and are held against the unit. In the modules, the respective control unit is located in the vicinity of the rear face and the micro-fluidic unit is situated in a region that is remote from the rear face. The control units can be connected to an electric line bus that runs through the rear wall unit via electric connectors that are located on the rear faces of the modules and on the rear wall unit and the micro-fluidic units of two respective neighboring modules are interconnected to allow the passage of fluid via a connecting part that contains connection channels and that spans the relevant modules.