Morfologia e morfometria da matriz extracelular do tendão do músculo extensor curto do polegar em cadáver humano

Abstract

The extracellular matrix is a network of macromolecules made up of fibrous and non-fibrous components. Among the fibrous components, are the elastic and Collagen fibers. The objective of this work was to analyze these two types of extracellular matrix fibers of the tendon of the short extensor pollicis of adult human cadavers, identifying morphological and morphometric differences in regions that display properties different biomechanical. Six adult human cadavers were used, from the anatomy lab at the Universidade Tiradentes, whose tendons short extenders of the thumbs were dissected from its proximal to the distal insertion. The tendons were dissected, fixed and submitted to the microtomy technique and stained by Verhöeff's method, hematoxylin-eosin, Masson's trichrome and picrosyrius-hematoxylinThe morphological analysis showed that the distal tendon region presented a fibrocartilaginous structure with rounded cells resembling chondrocytes and collagen fibers thicker and less collated. However, when compared with the tendon or proximal region, their bundles of collagen were birefringent, well organized, arranged parallel to each other and interspersed by fibroblasts. On what concerns the elastic fibers, they have been observed especially among the bundles of collagen in tendon region and around blood vessels. The morphometric measurements showed a still higher level of collagen process in the regions of tension.