Figure 195 from Chapter 5 (Endoplasmic Reticulum) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. Selective staining of tubular invaginations of the sarcolemma in the tibialis anterior of the mouse. Following fixation by glutaraldehyde solution containing calcium, the tissue was post-fixed with osmium ferrocyanide, resulting in staining of the T-tubules and sacrotubules of the reticulum. The adjacent terminal cisternae and longitudinal sarcotubules are lightly stained. Image by Michael Forbes. A PDF copy of the accompanying chapter is available on the ASCB's BioEDUCATE website.