February 10, 2018

Fat cells

In most mammals there are two distinct types of fat cells which differ considerably in size, number, distribution and metabolic activity. There are white adipose cells and brown adipose cells.

The bulk of fat cells are the white adipose cells organized as adipose tissue in the subcutaneous layers, the mesenteries and omentum, the retroperitoneal regions and as isolated fat cells in loose connective tissue. White adipose tissue composed of fat cells which generally contain a single, large droplet of lipid, primary in the form of triglycerides.

These spherical cells have a diameter from a minimum of 30 to 40 μm to a maximum of 50 to 160 (lean mammary subcutaneous) and from a minimum of about 20 to 30 μm to maximum of about 90 to 100 μm.

White adipose cells
Brown adipose cells are much less abundant and occur only in restricted areas. The shape of brown adipocytes is polygonal or ellipsoid, with a maximum diameter between a minimum of 15 to 20 μm a maximum of 40 to 50 μm.

Brown adipocytes are characterized by an abundance of small lipid droplets in contrast to white adipocytes which typically feature a single large lipid droplet.
Fat cells
at 5:10 AM
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