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Fig. 1D. —55-year-old male cadaver. Photomicrograph of axial section of trachea shows trachea to consist of mucous membrane (epithelium [thin arrows] and submucosal tissue [S]), cartilage (C), and adventitia (open arrows). Thicknesses were approximately 1 mm for mucous membrane and cartilage and approximately 0.1-0.3 mm for adventitia. (H and E, x4)