Fat tissue, SEM Fat tissue. Coloured scanning electron micrograph (SEM) of fat cells (adipocytes, round) surrounded by fine strands of supportive connective tissue. Adipocytes are among the largest cells in the human body, each cell being 100 to 120 microns in diameter. Almost the entire volume of each fat cell consists of a single lipid (fat or oil) droplet. Adipose tissue forms an insulating layer under the skin, storing energy in the form of fat, which is obtained from food. Magnification: x400 when printed 10 centimetres wide.