JOSE CALVO / SCIENCE PHOTO LIBRARY JOSE CALVO / SCIENCE PHOTO LIBRARY
Layers of trachea wall, light micrograph. The uppermost layer is the mucosa, which is lined by pseudostratified columnar epithelium (respiratory epithelium). Below this is the lamina propria, which contains blood vessels (ovals) filled with red blood cells (pink). Beneath this is hyaline cartilage (dark purple) and then the adventitia layer. Magnification: x36 when printed at 10 centimetres wide.
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