Human aorta, light micrograph
Light micrograph of a cross-sectioned wall of a human aorta stained with the Cajal-Gallego method for the demonstration of elastic elements. The method allows a clear distinction between the tunica media with abundant elastic lamellae (stained magenta by fuchsin) and the tunica adventitia, which is rich in collagen fibres (stained blue by indigo carmine)., by JOSE CALVO / SCIENCE PHOTO LIBRARY
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