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TitleDescriptionSubjectCollection
1 : Lymph node (rat)Electron microscopy. A low magnification of a part of the medulla showing medullary cords surrounded by labyrinthine medullary sinus (*). In this picture the medullar cord runs from left bottom corner to right top corner, and is lined by flat reticular cell types. Within the cord one finds a star-sh...medulla; electron microscopy; sinusoidPoja Histology Collection - Lymphatic Tissues and Organs Subset
2 Anchoring villi (human placenta, early midpregnancy)Stain: Hematoxylin -azophloxine. Survey (A) and detail (B). The maternal side at the bottom shows reddish matrix-type fibrinoid accumulations (1) (Rohr's fibrinoid layer) close to an anchoring villus (2) and the cytotrophoblastic cell columns (3). The anchoring villus is lined by cytotrophoblast...placenta; chorionic villi; Hofbauer cell; anchoring villus; cytotrophoblastPoja Histology Collection - Placenta
3 Anchoring villi (human placenta, early midpregnancy)Stain: Hematoxylin -azophloxine. The maternal side at the bottom shows reddish matrix-type fibrinoid accumulations (1) (Rohr's fibrinoid layer) close to an anchoring villus (2) and a cytotrophoblastic cell column (3). The anchoring villus is lined by cytotrophoblasts (4) which are covered at th...placenta; anchoring villus; fibrinoid; deciduas; cytotrophoblastPoja Histology Collection - Placenta
4 Complete hydatidiform mole (human)Stain: (A) Hematoxylin-eosin. (B+C) Immunoperoxidase staining with diaminobenzidin (DAB) and hematoxylin counterstaining for keratin 7 (OVTL 12-30 antibody). (A)Trophoblast cells surround the dilated chorionic villi (1), with centrally large amounts of edematous mesenchymal stroma with almost no b...trophoblast; complete hydatidiform mole; placenta; villus; immunohistochemistry; keratin-7Poja Histology Collection - Placenta
5 Calcified bacterial plaque in palatine tonsil ('gut-associated lymphatic tissue' or GALT) (human)Stain: Azan. A tonsillar crypt lined by squamous epithelium (2) that is infiltrated with lymphocytes (1). It is a normal finding that within the crypts free cells, plugs of lymphocytes (1) and calcified epithelial debris as well as colonies of oral commensally bacteria are present. (3) shows a calc...bacterial plaquePoja Histology Collection - Lymphatic Tissues and Organs Subset
6 Cortex of lymph node (human)Stain: Azan. The cortex of the lymph node comprises the (secondary) follicles with germinal centres (1) and corona or mantle zone (2), all filled with B lymphocytes. The paracortical area (3) below the follicles largely comprises T cells. Afferent lymph vessels enter via the capsule (6) into the m...cortex; paracortexPoja Histology Collection - Lymphatic Tissues and Organs Subset
7 Epithelial lining of trachea and bronchiolus (mammals)Left side trachea: Columnar ciliated cells (1) with up to 200 motile cilia with an organelle-rich apex and in the middle a goblet cell (2) with accumulation of mucus secretion granules in the apex. Note that all epithelial cells (i.e., junctions) contact the basal lamina. Four basal cells (3) do not...Bronchiolus; Pseudostratified epithelium; Ciliated epithelium; Clara cells; Basal cells; Neuro-endocrine cellsPoja Histology Collection - Respiratory System Subset
8 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
9 Neuroepithelial body in terminal bronchiolus (golden hamster)Electron microscopy. Three epithelial cells, as part of the N(euro) E(pithelial) B(ody), contribute to a cluster of neuroendocrine cells. They belong to the Amine Precursor Uptake and Decarboxylation cell system so-called APUD cells. The dense-core granules (↓) contain among others dopamine or ser...Terminal bronchiolus ; Neuro-endocrine cellsPoja Histology Collection - Respiratory System Subset
10 Keratin 7 in the bronchial epithelium of the lung (human, adult)Stain: anti-keratin 7 antibody (Pan-Ck 7) immunoperoxidase staining (with aminoethylcarbazole (AEC) substrate). The epithelium of the bronchus (1) stains dark brown-red after the reaction with AEC indicating a positive reaction for cytokeratin 7. This antibody can be used in the study of development...Bronchiolus; Immunoperoxidase; Immuno-reactionPoja Histology Collection - Respiratory System Subset
11 Surface of olfactory epithelium (rat)Electron microscopy. Bottom left shows an olfactory bulb (1, vesicle) with cross-sectioned basal bodies. Right side part of the apex of a supporting cell (2) with microvilli (3). Parallel to the surface of the epithelium one long olfactory cilium (4) and several other cross-sectioned ones are detect...Olfactory epithelium; Olfactory vesiclePoja Histology Collection - Respiratory System Subset
12 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
13 Scheme of the epiglottis (human, adult)The laryngeal side of the epiglottis (1) is covered with respiratory epithelium, while the lingual side (2) is similar to the oral cavity epithelium (squamous type). The transitional zone to respiratory epithelium is marked by (3). The scaffold consists of elastic cartilage (4). Seromucous laryngea...Laryngeal glands; Oral cavityPoja Histology Collection - Respiratory System Subset
14 Epithelial lining of bronchiolus in the lung (rat)Scanning electron microscopy. 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.Bronchiolus ; Ciliated epithelium ; Clara cellsPoja Histology Collection - Respiratory System Subset
15 Transitional region of epiglottis (human, high magnification)Stain: Hematoxylin and eosin. Transition of squamous epithelium into pseudostratified epithelium. Note diapedesis of lymphocytes (darker stained rounded cells) through the epithelial barrier (→). The proper lamina presents some lymphocyte infiltration.DiapedesisPoja Histology Collection - Respiratory System Subset
16 Keratin 7 in the lining alveolar epithelium of the lung (human, adult)Stain: anti-keratin 7 antibody (Pan-Ck 7) immunoperoxidase staining (with aminoethylcarbazole (AEC) substrate). Both alveolar epithelial cell types I (1) and II (2) stain dark brown-red after the reaction with AEC indicating a positive reaction for cytokeratin 7. Note the white (non-stained) capilla...Pneumocyte I; Pneumocyte II; Imunoperoxidase; Immuno-reactionPoja Histology Collection - Respiratory System Subset
17 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
18 Respiratory bronchiolus (human)Stain: Hematoxylin and eosin. A longitudinal section shows the lumen of a respiratory bronchiolus (1) with an irregular lining. It is covered by low columnar-cuboidal cells, a few pouches within the same lumen are lined by thin alveolar epithelium as found in the surrounding alveoli (2). Thin arrows...Respiratory bronchiolus; Columnar epithelium; Cuboidal epithelium; Clara cells; Alveolar epitheliumPoja Histology Collection - Respiratory System Subset
19 Nasal concha (dog, isolated turbinate bone)Stain: Hematoxylin and eosin. This concha (turbinate with red-black-stained bone (1), is covered by a thin respiratory mucosa (3) and by a thick olfactory mucosa (2, arrow). Within the respiratory epithelium light stained goblet cells are visible between the low columnar/cuboidal epithelial cells (c...Conchae nasales; Olfactory epithelium; Respiratory epitheliumPoja Histology Collection - Respiratory System Subset
20 Small bronchus (golden hamster)Electron microscopy. 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 gran...Ciliated epitheliumPoja Histology Collection - Respiratory System Subset
21 Striated duct of nasal gland (rat)Electron microscopy. At (1) lumen of duct, (2) indicates nucleus of lining epithelial cell. Note the abundancy and palisade-like arrangement of mitochondria (3) in the basolateral regions, in the light microscope visible as a fine striation, hence the name striated duct or intralobular duct. (4) ind...Nasal vestibulum; Nasal glands; Striated duct; Intralobular duct; Seromucous glandsPoja Histology Collection - Respiratory System Subset
22 Late terminal sac period of developing lung (human, fetus, low magnification)Stain: Hematoxylin and eosin. Cross-sections of a bronchus (1) with cartilage rings (2) closely associated with pulmonary arteries (3). The alveolar appearance is evident, and the open spaces represent future alveolar duct systems as well as alveolar sacs. The cellular septa are still thick due to n...Lung development; Terminal sac periodPoja Histology Collection - Respiratory System Subset
23 Elastin in alveolus of lung tissue (human, adult)Immuno-electron microscopy (embedded in Lowicryl HM 20). Elastin (E) is labeled with electron-dense gold particles of 10 nm. Note that the amorph elastin appears pale after embedding in this type of resin. (A) indicates alveolar space, (F) unlabelled myofibrolast, (C) collagen fibers, and (1) the th...Alveolar cells type I; Myofibroblasts; Immuno-electron microscopy; Immuno-stainingPoja Histology Collection - Respiratory System Subset
24 Survey of epiglottis (human)Stain: Azan. Centrally light-stained elastic cartilage (e). Lingual side (LI) is covered with squamous epithelium. At the laryngeal side (LA) the squamous epithelium usually turns into respiratory epithelium with seromucous laryngeal glands (*).Laryngeal gland; Oral cavityPoja Histology Collection - Respiratory System Subset
25 Lamellar body of a type II alveolar cell in the lung (dog)Electron microscopy. Extrusion of surfactant material out of a type II alveolar cell (pneumocyte II, great alveolar cell). After fusion of a multilamellar body (1) (cytosome) with the apical cell membrane (note microvilli 2) the electron-dense lamellar content or surfactant (consisting of phosphatid...Type II alveolar cell; Pneumocyte II; Multilamellar bodies; Cytosomes; Tubular myelinPoja Histology Collection - Respiratory System Subset
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