the fat body of insects is in the form of loose masses of cells which are mesodermal in origin.
membraneous connective tissue sacs enclose these cell clusters. they look like aggregatesof blood cells.
They freely project into the haemocoele and are penetrated by a dense network of fine tracheoles.
The major part of the fat body is built up of cell calles trophocytes.
In the young animal the trophocyte is small, comparatively clear and with large, rounded nucleus.
In due course, the cell develops cytoplasmic vacuoles and becomes enlaged due to deposits of glycogen,fats,or protein. At metamorphosis, albuminoid granules appear in the cytolipids in Anthrenus.
Droplets of the enzyme lipase are associated with each droplet of fat.