在冬眠動物的體內也較多。在寒冷的環境下，棕色脂肪細胞內的脂類迅速氧化，產生大量熱能，有利于新生兒的抗寒和維持冬眠動物的體溫。網狀組織（reticular tissue）是由網狀細胞、網狀纖維和基質組成。1．網狀細胞（reticular cell）為星形多突起細胞，其突起彼此連接成網。胞質弱嗜堿性。核較大、橢圓形、染色淺、核仁清楚。2．網狀纖維網狀纖維細而多分支，沿著網狀細胞的胞體和突起分布（即網狀細胞附于其上）。網狀纖維分支互相連接成的網孔內充滿基質（在淋巴器官和造血器官分別是淋巴液和血液）。體內沒有單獨存在的網狀組織，它是構成淋巴組織、淋巴器官和造血器官的基本組成成分。分布于消化道、呼吸道粘膜固有層、淋巴結、脾、扁桃體及紅骨髓中。在這些器官中，網狀組織成為支架，網孔中充滿淋巴細胞和巨噬細胞，或者是發育不同階段的各種血細胞。網狀細胞則成為T、B淋巴細胞和血細胞發育微環境的細胞成分之一。成纖維細胞（fibroblast）是疏松結締組織的主要細胞成分。細胞扁平，多突起，呈星狀，胞質較豐富呈弱嗜3-3成纖維細胞左和纖維細胞右超微結構模式3-3成纖維細胞左和纖維細胞右超微結構模式堿性。胞核較大，扁卵圓形，染色質疏松著色淺，核仁明顯（圖3－2 ）。在電鏡下，胞質內富于粗面內質網、游離核糖體和發達的細菌爾基復合體，表明細胞合成蛋白質功能旺盛（圖3－3，3－4）。成纖維細胞既合成和分泌膠原蛋白，彈性蛋白，生成膠原纖維、網狀纖維和彈性纖維，也合成和分泌糖胺多糖和糖蛋白等基質成分。成纖維細胞處于功能靜止狀態時，稱為纖維細胞（fibrocyte）（圖3 －3）。細胞變小，呈長梭形，胞核小，著色深，胞質內粗面內質網少、細菌爾基復合體不發達，嗜酸性。在一定條件下，如創傷修復，結締再生時，纖維細胞又能再轉變為成纖維細胞。同時，成纖維細胞也能分裂增生。成纖維細胞常通過基質糖蛋白的介導附著在膠原纖維上。
In hibernation animals are also more. In a cold environment, lipids in brown fat cells rapidly oxidize and produce large amounts of heat, which are good for the newborn's cold resistance and maintaining the body temperature of the hibernating animal. Reticular tissue is composed of reticular cells, reticular fibers and matrix. 1. Reticular cells are asteroid papillae, the projections of which are connected to each other in a network. Cytoplasmic weakly basophilic. Larger nuclei, oval, stained light, clear nucleolus. 2. Reticular fibers Reticular fibers are fine and branched, distributed along the cell body and projections of reticular cells (ie, reticulocytes attached thereto). Mesh fiber branches interconnected into the mesh filled with matrix (lymphoid organs and hematopoietic organs were lymph and blood, respectively). There is no separate reticular tissue, which constitutes the basic components of lymphoid tissues, lymphoid organs and hematopoietic organs. Distribution in the digestive tract, respiratory mucosal lamina propria, lymph nodes, spleen, tonsils and red bone marrow. In these organs, the reticular tissue becomes a scaffold, the mesh is filled with lymphocytes and macrophages, or various blood cells that develop at different stages. Reticular cells become one of the cellular constituents of T, B lymphocytes and the microenvironment of hematopoiesis. Fibroblasts are the major cellular components of loose connective tissue. Cells were flat, multi-protuberant, was star-shaped, more abundant cytoplasm was weak-addicted to 3-3 fibroblasts left and fibroblasts right ultrastructure mode 3-3 left fibroblasts and fibroblasts right ultrastructure mode alkaline. Larger nuclei, oval, chromatin loose pale, clear nucleoli (Figure 3-2). Under electron microscopy, the cytoplasm is rich in rough endoplasmic reticulum, free ribosomes, and well-established bacterial-based complexes, suggesting strong cellular protein synthesis (Figure 3-3, 3-4). Fibroblasts not only synthesize and secrete collagen, elastin, produce collagen fibers, reticular fibers and elastic fibers, but also synthesize and secrete glycosaminoglycans and glycoproteins and other matrix components. Fibroblasts in the quiescent state, called fibrocytes (fibrocytes) (Figure 3 -3). Cells become smaller, long fusiform, small nuclei, darker color, fewer endoplasmic reticulum cytoplasmic, bacterial basal complex is underdeveloped, eosinophilic. Under certain conditions, such as wound repair, connective tissue regeneration, fibroblasts can be transformed into fibroblasts. At the same time, fibroblasts can also divide and proliferate. Fibroblasts are often attached to collagen fibers mediated by matrix glycoproteins.

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