301 research outputs found
Further data on intracellular structure of human salivary glands: a SEM study. Eur. J. Morphol. (Lisse, The Netherlands):1996.
No full textA scanning and transmission electron microscope study of the human minor salivary glands
No full textThe epithelium of the excretory duct of the human submandibular gland: A transmission and scanning electron microscopic study
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Morphofunctional Studies on Human Labial Salivary Glands
No full textIn this study, the first experimental investigation carried out at the ultrastructural level on mucous cells of human salivary glands, we have examined by light microscopy (LM), transmission electron microscopy (TEM), high resolution scanning electron microscopy (HRSEM), the secretory response of labial glands stimulated in vitro by the beta-adrenergic agent, D,L isoproterenol, and by the muscarinic agent carbachol. For comparison we have used identical methods to study samples of mixed portions of human submandibular glands. Morphological findings obtained here on both submandibular and labial glands mucous cells demonstrate that mucous droplets are released solely by muscarinic stimulation, and that cytological events occurring during secretory discharge are similar to those described by others, using TEM, on stimulated mucous cells of rat sublingual glands. Despite the fact that human labial glands are said to have a prominent cholinergic innervation with scanty adrenergic nerves, the response of seromucous cells in these organs to stimulation with carbachol and with isoproterenol was similar to that observed by us, (using LM, TEM and HRSEM), in serous cells of human major salivary glands
Junctional complex revisited by high-resolution scanning electron microscopy
No full textThe present study correlates the ultrastructural morphology of junctional complexes as revealed by transmission electron microscopy (TEM) with that observed by high-resolution scanning electron microscopy (HRSEM), thanks to a new modification of the osmium tetroxide maceration technique. The removal of all cytoplasmic organelles by this technique allows the inspection of the inner side of the plasmalemma. With this treatment, a continuous band of tightly packed particles is observed at the most apical portion of lateral membranes. Just below this band, irregular clusters of apparently identical particles are placed all around the cellular contour. The topographical correspondence among these clusters and spot desmosomes seen by TEM identifies them as desmosomes. The continuous band seems to represent the combination of both zonulae, occludens and adherens. Regarding the nature of the particles, we suppose that they probably consist of peripheral membrane proteins clustered at the cytoplasmic surface of intercellular junctions and involved in the linkage between cytoskeleton and plasmalemma
A comparison between the secretory response of the submandibular gland with that of parotid gland following treatment with secretagogues in vitro. A morphometric study by HRSEM
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