Basement Membrane and Lamina Propria

A thick "basement membrane" is characteristic of tracheal epithelium

Located beneath the tracheal epithelium is a distinctive layer typically referred to as a "basement membrane." It usually appears as a glassy or homogeneous light-staining layer approximately 25 to 40 p,m thick (see Fig. 18.8). Electron microscopy reveals that it consists of densely packed collagenous fibers that lie immediately under the epithelial basal lamina. Structurally, it can be regarded as an unusually thick and dense reticular lamina and, as such, is part of the lamina propria. In smokers, particularly

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