A cross section of a bundle of nerve fibers. Axons (orange) are wrapped in myelin (purple); an extension of the membrane of glial cells. Myelin has high lipid content, and acts to insulate the axons, causing them to transmit nerve impulses much faster.
This brilliant gastric image comes just in time for lunch through much of the Western Hemisphere - mouse stomach section with mucous-secreting cells (red) along stomach lining & acid-producing cells (green & magenta).
Mushrooms Spores - Photographed by Brandon Broll, thus images is just one of many amazing microscopic photos in his book, Microcosmos, in which random things are magnified by between 22 times and 22 million times.
Why Are Pollen Allergies So Common? Scanning electron microscope image of pollen grains from a variety of common plants: sunflower, morning glory, prairie hollyhock, oriental lily, evening primrose and castor bean.