Description

Stacks of rough endoplasmic reticulum (ER) cisternae seen in a transmission electron micrograph of a section through a secretory acinar cell from the bat exocrine pancreas. The rough ER is here involved in the synthesis of digestive enzymes that will be secreted by the pancreas and delivered to the duodenum, the initial segment of the small intestine. Each flattened ER cisterna has ribosomes associated with its cytoplasmic surface.

Technical Details

Small sections of bat pancreas were fixed by immersion in a primary buffered glutaraldehyde fixative, postfixed in buffered osmium tetroxide, dehydrated and embedded in Epon prior to examination in an electron microscope. Original resource provided by Keith R Porter Archives (University of Maryland Baltimore County, Baltimore, MD).Still image jp2; 12-May-67; 4x5 inch glass plate negative. This image was to be included as Figure 2-27 in the unpublished 5th edition of the Porter-Bonneville atlas: Fine Structure of Cells and Tissues.