JOSE CALVO / SCIENCE PHOTO LIBRARY JOSE CALVO / SCIENCE PHOTO LIBRARY
Layers of trachea wall, light micrograph. At left is the mucosa layer, which consists of respiratory epithelium (uppermost) with goblet cells (purple ovals) and the lamina propria with elastic fibres (dark purple dots) and blood vessels (filled with yellow red blood cells). At right is the hyaline cartilage ring (red) and then the adventitia layer. Gabe technique. Magnification: x90 when printed at 10 centimetres wide.
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