8.5 POJA-L364 Title: Epithelial lining of bronchiole in the lung Description: Scheme electron microscopy, human. Two major cell types line a bronchiolus, a more cuboidal shaped ciliated one (1) that also exhibits microvilli with many organelles (including electron-dense lysosomal structures). The non-ciliated cells (2, Clara cells) appeared taller and dome-shaped and protrude into the lumen. These cells are well provided with organelles, the apical portion shows Golgi areas and numerous electron-dense secretory granules containing a mixture of cholesterol and glycosaminoglycans. When released onto the surface they probably provide a protective layer. On the basal lamina (3) a small neuroendocrine cell (4) (belonging to the Amine Precursor Uptake and Decarboxylation cell system so-called APUD cells). The dense-core granules contain among others dopamine or serotonin. Keywords/Mesh: respiratory tract, lung, small bronchus, bronchiolus, ciliated epithelium, goblet cell, Clara cell, endocrine cells, APUD cell, histology, electron microscopy, POJA collection |
8.5 POJA-L366
Title: Bronchial/bronchiolar lining in the lung Description: Electron microscopy, golden hamster. Epithelial lining of the smallest bronchia and bronchioli are often similar. Two ciliated cells with nuclei (1). Supranuclearly electron-dense lysosomes (2, lipofucsin) are present, the apical parts contain mitochondria (3) and cross-sections of cilia (4) and microvilli (5) are visible in the lumen (*). Two mucoid goblet cells with packed secretion granules (6) are interspersed in the epithelium. Subepithelially a fibroblast (7) with long extensions is located in between cross-sectioned thin collagen fibrils (8) |
8.5 POJA-L365
Title: Bronchiolar lining in the lung Description: Scanning electron microscopy, rat. Bushes of cilia indicate the presence of ciliated cells (1). Clustered non-ciliated cells (2, Clara cells) are dome-shaped with stubby microvilli at the surface, they protrude into the lumen to the tips of the cilia. |