Figures 358 (upper) and 359 (lower) from Chapter 15 (Cytoplasmic Inclusions) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. In some species, Sertoli cells, lipid droplets are abundant. Upper panel: multiple small and medium-sized lipid droplets at the base of Sertoli cells from the gerenuk (Litocranius walleri). Lower panel: Lipid droplet in a Sertoli cell from the ram (Ovis aries), surrounded by smooth reticulum. Figures from Fawcett in Handbook of physiology, Sect. 7, Vol. 5, AM. Phyiol. Soc., Washington D.C., 1975. A PDF copy of the accompanying chapter is available on the ASCB’s BioEDUCATE website.