Feitosa V L C, Reis F P, Esquisatto M A M, Joazeiro P P, Vidal B C, Pimentel E R
Department of Morphology, Federal University of Sergipe, Aracaju, SE, Brazil.
Micron. 2006;37(6):518-25. doi: 10.1016/j.micron.2006.01.010. Epub 2006 Feb 23.
Tendons are parallel arrays of collagenous fibers which are specialized in resisting and transmitting tensile forces. In this work we examined the structure of the superficial digital flexor tendon (SDFT) and the deep digital flexor tendon (DDFT) of pigs, which are considered "wrap around" tendons and so receive compression and tension forces. In both tendons, fibrocartilaginous areas were observed in the regions subjected to compression plus frictional loading. Histological and ultrastructural analyses of the tensional region showed an extracellular matrix (ECM) rich in collagen bundles, that were all arranged in the same direction. Fibroblasts were seen closely associated with the collagen bundles. Chondrocyte-like cells and high levels of glycosaminoglycans (GAGs) were observed in the compressional regions. The collagen bundles in the compressional region were arranged in several directions and were associated with proteoglycans (PGs). The crimp pattern detected in the tensional region showed that the collagen fibrils were ordered aggregates which formed helical superstructures.
肌腱是胶原纤维的平行排列结构，专门用于抵抗和传递拉力。在本研究中，我们研究了猪的指浅屈肌腱（SDFT）和指深屈肌腱（DDFT）的结构，这两种肌腱被认为是“环绕式”肌腱，因此会受到压缩力和拉力。在这两种肌腱中，在承受压缩力加摩擦力的区域观察到了纤维软骨区域。对张力区域的组织学和超微结构分析表明，细胞外基质（ECM）富含胶原束，且所有胶原束都沿同一方向排列。成纤维细胞与胶原束紧密相连。在压缩区域观察到类软骨细胞和高水平的糖胺聚糖（GAGs）。压缩区域的胶原束呈多个方向排列，并与蛋白聚糖（PGs）相关联。在张力区域检测到的卷曲模式表明，胶原原纤维是形成螺旋超结构的有序聚集体。
