Abstract
An electron microscopic study of aldehyde and osmium fixed normal guinea pig middle ear epithelium was made. Numerous branching microvilli occur between the cilia of the ciliated cells. The granules of the secretory cells are always surrounded by a membrane, and they vary in their content of electron dense substance. Half desmosomes are frequent in basal cells. The squamous epithelial cells of the bulla contain few microvilli and pinocytoric invaginations. In the basal part of the squamous epithelium dilations of the intercellular clefts often occur. The luminal part of the intercellular clefts are closed by multiple tight junctions.
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