Connective tissues are main components of the animal body. Under the name of connective there is a wide variety of tissues (Figure 1), but sharing some common features. One of them is that connective tissues differentiated from mesenchyma (mostly coming from the embryo mesoderm). In addition, they show a remarkable extracellular matrix, which is a scaffolding made up of collagen and elastic fibers, glycoproteins, proteoglycans, glycosaminoglycans, and other molecules. The type and proporti...
