JOSE CALVO / SCIENCE PHOTO LIBRARY JOSE CALVO / SCIENCE PHOTO LIBRARY
Cross-section of the trachea, showing C-shaped tracheal rings of hyaline cartilage (dark purple). Respiratory mucosa lines the inside of the trachea. The right lobule of the thyroid gland is at right. Magnification: x36 when printed at 10 centimetres wide.
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