China
Africa
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Neck and chest
Published in Jani van Loghem, Calcium Hydroxylapatite Soft Tissue Fillers, 2020
Yana A. Yutskovskaya, Anna Daniilovna Sergeeva
Aging of the skin occurs mainly due to atrophic changes in the dermis and hypodermis. The main substance is the redistribution of glycosaminoglycans, which undergo qualitative changes. The content of glycoproteins, in particular fibronectin, plays a role in the interaction of fibroblasts with collagen fibers. The fibers themselves atrophy and become looser. Collagen fibrils can lose periodic striation, and there is a delay in their maturation. Elastin fibers become coarse and partially fragmented. There are areas where they thicken, especially under the epidermis (senile elastosis). In this case, the hypodermis plays a major role, since it participates in the formation of granulation tissue—an important morphofunctional element of the regenerative process; there is a pool of undifferentiated, young and mature fibroblasts. The hypodermis also contains collagen, elastin, and reticular fibers [1].
Comparative Anatomy, Physiology, and Biochemistry of Mammalian Skin
Published in David W. Hobson, Dermal and Ocular Toxicology, 2020
Reticular fibers have been seen as thin, branching fibers in the dermis, usually more numerous beneath the basal lamina. The reticular fiber was once thought to be another fiber type present in the dermis. However, recent evidence using electron microscopy has shown the characteristic axial periodicity of 64 nm that is found in collagen fibrils. Therefore, it has been proposed that reticular fibrils may be collagen fibril templates.199
Introduction and Review of Biological Background
Published in Luke R. Bucci, Nutrition Applied to Injury Rehabilitation and Sports Medicine, 2020
Reticular connective tissues are composed of a network of reticular fibers in ground substance that forms the internal framework for visceral organs, such as liver, spleen, lymph nodes, and bone marrow. Some reticulocytes are fibroblast-like, while others are macrophage-like.
A comparative study of different amniotic membrane orientations during extraocular muscle surgery in rabbits
Published in Current Eye Research, 2018
Rehab Rashad Kassem, Randa Mohamed Abdel-Moneim El-Mofty, Mustafa Mahmoud Khodeir, Wael Mostafa Hamza
The amniotic membrane (AM) is the inner layer of the fetal membranes. It is 0.02–0.05 mm thick and consists of three different layers: the epithelium, basement membrane and stroma. The epithelium is a monolayer of metabolically active cuboidal cells with microvilli present on its apical surface. The epithelium rests upon a thick basement membrane composed of reticular fibers and is made up of type IV, V and VII collagen in addition to fibronectin and laminin. The stroma is avascular and is further divided into three contiguous but distinct layers: the inner compact layer (which is in contact with the basement membrane and contributes to the tensile strength of the AM), middle fibroblast layer (which is thick and made up of a loose fibroblast network) and the outermost spongy layer. The AM is immunologically inert. Following transplantation, it acts as a biological barrier between potentially adhesive surfaces, and its stromal matrix reduces inflammation, neovascularization and scarring.2–5
Attenuation of streptozotocin induced high fat diet exacerbated dyslipidemia mediated hepatic and aortic injuries in male pigs by camel milk
Published in Egyptian Journal of Basic and Applied Sciences, 2023
Hadiza Bello Rilwan, Sunday Samuel Adebisi, James Abrak Timbuak, Sunday Blessing Oladele, Aliyu Muhammad, Wusa Makena, Adamu Abubakar Sadeeq
The process of silver impregnation displays reticular fibers. The reticular fibers are clearly defined strands in a normal liver, but they reveal a discontinuous pattern in a necrotic and cirrhotic liver. The tissues were oxidized for 3 minutes in potassium permanganate, rinsed in distilled water, and then de-colored for 2 minutes in 2% oxalic acid. After washing and sensitizing the tissues with 4% iron alum for 10 minutes, they were rinsed with distilled water and impregnated with an ammoniacal silver solution for 11 seconds. The tissues were then rinsed in distilled water, fixed with 2% aqueous sodium thiosulfate (hypo) for 2 minutes, washed in distilled water, and counterstained with neutral red for 2 minutes. The tissue was then dehydrated, cleared, and mounted [30].
Development of Bioengineered Organ Using Biological Acellular Rat Liver Scaffold and Hepatocytes
Published in Organogenesis, 2020
Tanya Debnath, Chandra Shekar Mallarpu, Lakshmi Kiran Chelluri
These matrix proteins were preserved as indicated by structural and basement membrane components of the ECM in the decellularized liver scaffolds. More specifically, laminin was predominantly found in the basement membrane of larger blood vessels and the liver matrix whereas, collagen type I was preserved in the sinusoids and the portal ducts. The reticulin staining demonstrated the presence of reticular fibers in the parenchymal matrix of the decellularized tissues without any nuclear component (no DAPI staining). The native fresh rat liver also demonstrated similar expression of extracellular matrix proteins along with the preserved nucleus as shown by DAPI staining (Figure 2a-h).