Mitochondria can show tremendous variation in size, even within a single cell. Here, a huge spherical mitochondria of about 6-7 µm in diameter is adjacent to small elongate mitochondria 0.5 µm wide...

A transmission electron micrograph of a Leydig cell isolated from guinea pig testes.The eccentric nucleus and several pale lipid droplets are visible. Numerous mitochondria and smooth endoplasmic ret...

Figure 188 from Chapter 5 (Endoplasmic Reticulum) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. Dense smooth endoplasmic reticulum is found in steroid-secreting cells, like this cell from the zona fa...

Figure 240 from Chapter 7 (Mitochondria) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. The shape of mitochondrial cristae can vary with cell type, shown here in a cell from hamster adrenal cortex. Fo...

Figures 213 (upper) and 214 (lower) from Chapter 6 (Golgi Apparatus) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. The Golgi complex of a Leydig cell from guinea pig testis (upper) and from and acina...

A transmission electron micrograph of a Leydig cell isolated from guinea pig testes. This is a higher magnification image of CIL: 41116 highlighting the distinct nucleolus and a membrane-bound, debri...

Nuclear pores are clearly seen in these transmission electron micrographs of cells after cryo-fixation, freeze-fracture and surface replication. Upper panel shows the outer surface of of the nuclear e...

Tubules within the cristae of mitochondria can sometimes take on unusual configurations. Here, in the upper panel, a mitochondrion from an astrocyte in hamster brain appears to have prismatic tubules...

Figures 173 (upper panel) and 174 (lower panel) from Chapter 5 (Endoplasmic Reticulum) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. Electron micrographs of endoplasmic reticulum with the section pla...

Typical organization of gap junctions as seen in thin sections (upper) and replicas of freeze-fractured cell membranes (middle and lower). Upper, gap junction from the saccular macula of a goldfish; ...