Figure 179 from Chapter 5 (Endoplasmic Reticulum) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. Electron micrograph showing a portion of the cytoplasm of a liver cell. The upper left part of the micrograph shows a network of branching and anastomosing smooth tubules that appear to connect with the cisternae of the rough endoplasmic reticulum (points of interconnection indicated by arrows). Image by Robert Bolander. A PDF copy of the accompanying chapter is available on the ASCB’s BioEDUCATE website.