Brush cell in lung (rat)

Electron microscopy. In the proximal as well as in the terminal airways a special type of cell the so-called brush(-border) cell could be observed. In this picture this cell (X) is located in the alveolar space. At (*) the brush border, the dense cytoplasm contains many organelles. (C) is a capillary that contains an erythocyte and part of a neutrophilic granulocyte (1). The surrounding interstitium contains interstitial cells (2), collagen and elastin. Small dense fluffy granular spots everywhere represent coagulated serum proteins.