Figure 187

Scanning electron micrograph of the luminal surface of a bronchus.

The nonciliated cells are the goblet cells (G). Their surface is characterized by small blunt microvilli that give a stippled appearance to the cell at this low magnification. The cilia of the many ciliated cells occupy the remainder of the micrograph. Note how all are "synchronously" arrayed (i.e., uniformly leaning in the same direction) appearing just as they were when fixed at a specific moment during their wave-like movement, x 1,200.

those who experience chronic coughing, this layer may be considerably thicker, a response to mucosal irritation.

The lamina propria, excluding that part just designated as basement membrane, appears as a typical loose connective tissue. It is very cellular, containing numerous lymphocytes, many of which infiltrate the epithelium. Plasma cells, mast cells, eosinophils, and fibroblasts are the other cell types readily observed in this layer. Lymphatic tissue, in both diffuse and nodular forms, is consistently present

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