One of the special features of the Trachea is the PCC (pseudostratified ciliated columnar) on the internal surface which keeps the air passage clear of debris. Another is the hyaline cartilage C-rings that keep the trachea open.

Note also the mucous glands emptying mucous into a duct which carries it to the surface. This also aids in trapping debris that enters the trachea.

Click on green squares to see details of the Trachea.

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