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Histology of Trachea

 Image taken from http://www.lab.anhb.uwa.edu.au After inhaled air has passed through the nose, pharynx, and larynx, it enters the trachea.  The trachea is a thick-walled tube, some 12 cm in length, that directs air down toward the pair of primary bronchi that enter the lung.  The trachea’s inner surface, facing the lumen, is lined by a … Continue reading →