Adipose connective tissue cells are specialized for fat storage and do not form ground substance or fibers.  On prepared slides, adipose tissue appears somewhat like a fish net with white spaces connected together in a network.  The cytoplasm and nucleus have been pushed to one side by a single, large, fat-filled vacuole that occupies the center of the cell.  In this  cross section from the trachea,  the adipose cells  are located in the outer most layer (adventitia) of the organ.