Arteriole, light micrograph
Light micrograph of a cross-sectioned arteriole showing, from the lumen: endothelium, discontinuous internal elastic lamina (typical feature of arterioles), three layers of smooth muscle fibres and adventitia. 0.5 micrometre thick section of plastic embedded material stained with toluidine blue., Photo by JOSE CALVO / SCIENCE PHOTO LIBRARY
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