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Microscopically, the cystic space contains necrotic cell debris and macrophages filled with phagocytosed material. The cyst wall is formed by proliferating capillaries, inflammatory cells, and gliosis (proliferating glial cells) in the case of brain and proliferating fibroblasts in the case of abscess cavities. Brain cells have a large amount ...
An important feature of granulomas is whether or not they contain necrosis, which refers to dead cells that, under the microscope, appear as a mass of formless debris with no nuclei present. A related term, caseation (literally: turning to cheese ) refers to a form of necrosis that, to the unaided eye, appears cheese-like ("caseous"), and is ...
Fibroblasts, the main cells that deposit granulation tissue, depend on oxygen to proliferate and lay down the new extracellular matrix. [7] In vascularisation, also called angiogenesis, endothelial cells quickly grow into the tissue from older, intact blood vessels. [8] These branch out in a systematic way, forming anastomoses with other vessels.
Mucociliary clearance (MCC), mucociliary transport, or the mucociliary escalator describes the self-clearing mechanism of the airways in the respiratory system. [1] It is one of the two protective processes for the lungs in removing inhaled particles including pathogens before they can reach the delicate tissue of the lungs.
Caseous necrosis in the kidney. In caseous necrosis no histological architecture is preserved (unlike with coagulative necrosis). [5] [6] On microscopic examination with H&E staining, the area is acellular, characterised by amorphous, roughly granular eosinophilic debris of now dead cells, [6] also containing interspearsed haematoxyphilic remnants of cell nucleus contents. [5]
Benign cyst kidney; radiological appearances mimic renal cancer, A cyst / s ɪ s t / is a closed sac, having a distinct envelope and division compared with the nearby tissue.Hence, it is a cluster of cells that have grouped together to form a sac (like the manner in which water molecules group together to form a bubble); however, the distinguishing aspect of a cyst is that the cells forming ...
Microbial cysts have been likened to modified vegetative cells with the addition of a specialized capsule. [7] Importantly, encystment is a process observed to precede cell division, [8] while the formation of an endospore involves non-reproductive cellular division. The study of the encystment process was mostly confined to the 1970s and '80s ...
The microscopic and ultrastructural features support the theory that Amnion nodosum is made up of deposits of cellular elements from the fetal skin that accumulate and organize on the surface of the amniotic epithelium and undergo secondary degenerative changes before being invaded by connective tissue. [3]