Zona glomerulosa of the adrenal cortex, light micrograph. It is formed by elongated cells that are arranged to form elongated ovoid nests separated by connective tissue septa where blood vessels are located. These cells have lipid droplets as is typical of steroid-secreting cells, although as can be seen here, the droplets are smaller and more numerous than in the zona fasciculata. 0.5 micrometre thick semithin section of plastic-embedded material stained with toluidine blue.