Health Education Assets Library (HEAL)
 
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TitleDescriptionSubjectCollection
1 Air-blood barrier in the lung (mammals)Scheme electron microscopy. (1, ↓) Represents type I pneumocytes lining alveolar spaces (A). Cell (2) represents a free alveolar macrophage. The type II pneumocyte (3) is adherent to type I pneumocyte extensions (note junctional connection), and contains multilamellar bodies (surfactant). A myofib...Pneumocyte type I ; Pneumocyte type IIPoja Histology Collection - Respiratory System Subset
2 Alveolar cell type II (pneumocyte II) in an alveolus (dog)Electron microscopy. At (X) the alveolar space, the bulging alveolar cell type II shows the characteristic multilamellar bodies (*, cytosomes) that contain precusor material of surfactant. The lamellar bodies are responsible for the vacuolated appearance of these cells, and they give rise to surfact...Pneumocyte II; Alveolar cell type IIPoja Histology Collection - Respiratory System Subset
3 Alveolar cells in the lung (mammals)Scheme electron microscopy. (5) alveolar space; (6) type I Pneumocyte; (7) basal lamina; (8) myofibroblast; (9) collagen and elastin fibers; (10) mesothelial cell of the visceral pleura; (11) capillary with erythrocyte; (12) endothelial cell lining the capillary; (13) type II pneum...Pneumocyte type I ; Pneumocyte type I IPoja Histology Collection - Respiratory System Subset
4 Alveolar duct in the lung (mouse)Stain: PAS and hematoxylin. Part of an alveolar duct lumen (1) that shows bronchiolar characteristics such as cuboidal epithelium (2) covering a bundle of smooth muscle (3) and connective tissue containing macrophages (4) with black pigment deposits. Note PAS-positivity of these cuboidal cells (Clar...Alveolar ducts; Clara cellsPoja Histology Collection - Respiratory System Subset
5 Alveolar macrophage in lung (rat)Electron microscopy. A wandering alveolar macrophage (1) migrates through an alveolar pore from an alveolar space (A1) into another (A2). Note the dark lysosomal structures and abundant organelles in its cytoplasm. The thin lining type I alveolar cell is hardly discernable (thin arrows →). Interst...Pneumocyte I; Alveolar macrophagesPoja Histology Collection - Respiratory System Subset
6 Alveolar macrophages in lung (human, adult)Electron microscopy. Two macrophages in the alveolar space (N = nucleus). Note the heterogeneity of many lysosomal structures containing among others carbon particles and the abundancy of organelles.Alveolar macrophagesPoja Histology Collection - Respiratory System Subset
7 Alveolar sac in the lung (human)Stain: Azan. Characteristic alveolar tips (arrows) of neighbouring thin-walled alveoli (1). The tips contain elastin masked by collagen (blue-stained). At (2) small pulmonary arteries.Alveolar tipsPoja Histology Collection - Respiratory System Subset
8 Alveolar septum in the lung (human, high magnification)Stain: Azan. Two neighboring alveoli separated by a septum. (1) points to the tip containing bluish-pink elastin and collagen. The nucleus of a squamous alveolar cell (type I pneumocyte) is indicated by (2), and a free alveolar macrophage by (3).Alveolar tip; Pneumocyte IPoja Histology Collection - Respiratory System Subset
9 Alveolus in lung (dog)Electron microscopy. (A) indicate alveolar space; (C) indicate capillary with erythrocyte. Drawing-pin represents endothelium. (1) type I alveolar cell; (↓) indicate thin cytoplasm of pneumocyte I. (2) type II alveolar cell. (3) alveolar macrophage. (*) are spots of elastin, intermingled with coll...Pneumocyte I; Pneumocyte II; Alveolar cells; Alveolar macrophagePoja Histology Collection - Respiratory System Subset
10 Arbor bronchialis, the bronchial tree (human, adult)Resin corrosion cast of the lower trachea and bronchial tree (posterior aspect). The lobar and segmental bronchi and their main branches are coloured, different colours indicate areas supplied by different segmental bronchi. White-coloured lower trachea (Tr) divides into two principal bronchi (Bp)...Segmental bronchi ; MacroscopyPoja Histology Collection - Respiratory System Subset
11 Bronchiolus and alveoli in lung (human, adult)Stain: Hematoxylin and eosin. (1) indicates a bronchiolus with respiratory epithelium and muscle fibers in its wall. Alveolar spaces (2) are separated by alveolar cell types that lined thin septa with capillaries. The septa end in tips and knobs (3).Bronchiolus; Alveolar septa; Pneumocyte I; Pneumocyte II; Alveolar cell typesPoja Histology Collection - Respiratory System Subset
12 Bronchiolus in the lung (human, adult)Stain: Azan. The lumen of the bronchiolus is lined with one layer of ciliated epithelium (1) and is folded due to the contraction of smooth muscle fibers (2) in the wall. Note the rich cellularity (3) in the stromal surrounding of the bronchiolus. Alveolar space (4). (5) pulmonary artery branches.Ciliated epithelium; BronchiolusPoja Histology Collection - Respiratory System Subset
13 Bronchiolus in the lung (human, adult)Stain: Azan. The lumen is lined with one layer of ciliated epithelium (1) without goblet cells. Patches of smooth muscle fibers (2) are present. Notice small bronchial arteries (*). Arrows (↓) indicate sites of carbon accumulations between the alveoli (3).Bronchiolus; Ciliated epitheliumPoja Histology Collection - Respiratory System Subset
14 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 capillar...Brush cellsPoja Histology Collection - Respiratory System Subset
15 Brush cell in lung (rat)Electron microscopy. In the proximal as well as in the terminal airways a special type of cell can be observed, the so-called brush (-border) cell. In this picture this cell is located in the alveolar space. At (1) the brush border of thick plump microvilli. In the cytoplasm a Gogi area, mitochondri...Brush cellPoja Histology Collection - Respiratory System Subset
16 Bullous emphysema of the lung (honeycomb lung, human, adult)Macroscopy of the left lung showing large apical bullae (3) due to total destruction of all alveoli leaving remnants of the covering pleura. (2) indicates small bullae of foci of destroyed lobules with permanent enlargement of the air spaces and (1) points to spots of anthracosis in less-affected lu...Macroscopy; Honeycomb lung; Interstitial fibrosis; Hamman-Rich SyndromePoja Histology Collection - Respiratory System Subset
17 Capillary system of a lung alveolus (cat)Stain: specimen injected with India ink via the pulmonary system. In an en face view of the alveolar wall the black- and granular-stained capillary plexus is well shown. The larger vessels represent branches of the pulmonary arteriole.Poja Histology Collection - Respiratory System Subset
18 Capillary system of an alveolus (cat)Stain: specimen injected with trypan blue in gelatin via the pulmonary system. In a tangential view the blue-stained dense capillary plexus of one alveolus is well shown.Poja Histology Collection - Respiratory System Subset
19 Capillary system of lung alveoli (cat)Stain: specimen injected with trypan blue in gelatin via the pulmonary system. In a tangential view the blue-stained dense capillary plexus surrounding each alveolus is well depicted.Poja Histology Collection - Respiratory System Subset
20 Clara cell in lung (gerbil)Electron microscopy. In this species a non-ciliated Clara cell (1 = nucleus) contains numerous electron-gray secretion granules (2) of varying sizes, smaller more dense granules tend to localize in the apex of the cell. Between the granules agranular endoplasmic reticulum. Irregular blunt microvill...Respiratory bronchiolus ; Clara cells; Secretory granulesPoja Histology Collection - Respiratory System Subset
21 Detail of elastin in an alveolar tip in lung tissue (human, adult)Electron microscopy. Note the lace-like pattern of lumps of amorph elastin (X) that appears more electron-dense than the collagen fibers (C). At this high magnification cross-sectioned microfibrils (that contain among others fibrillin) are present in close association (*) with different areas of ela...Elastin-associated proteins; Elastoblast; MyofibroblastPoja Histology Collection - Respiratory System Subset
22 Detail of lamellar body (surfactant) and type I alveolar cell in lung (rat)Electron microscopy. After fixation the extracellular lining of surfactant (phosphatidylcholine, phosphoglycerol, cholesterol and proteins) will often be present as free packed lamellae in the alveolar space (4). This so-called tubular myelin is observed as stacks (5) of lipid crystals and aqueous l...Pneumocyte I ; Pneumocyte II; Alveolar cells; Tubular myelinPoja Histology Collection - Respiratory System Subset
23 Developing conchae in a frontal section of head (pig, fetus)Stain: Azan. The fetal conchae develop like a branched gland (1) within the blue-stained trabecular bone (2) of the future skull. The fetal skin (3) is present at the top and bottom. Groups of cheek musculature (4) in middle left and right side. A broad sleeve of chin muscles below (5). The developi...Conchae nasales; Trabecular bonePoja Histology Collection - Respiratory System Subset
24 Elastic fibers in the lung (human)Stain: Orcein. At the left (1) several alveoli (A) are depicted with a faint staining of cellular elements. The elastic fibers within the alveoli are stained reddish-purple. At the right (2) a high magnification of a tangential-sectioned alveolus shows the thicker bundles as well as very thin branch...Elastic fibersPoja Histology Collection - Respiratory System Subset
25 Elastin close near the alveolar tip in lung tissue (human, adult)Electron microscopy. The alveolar tip in the alveolar spaces (Alv) is covered with flattened type I alveolar cells (2). The arrows at (↓1) indicate the junctions between these flattened cells. The amorph elastin (*) in the alveolar tip appears more electron-dense than the collagen fibers (Col). No...Type I alveolar cells; Elastin-associated proteinsPoja Histology Collection - Respiratory System Subset
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