connective tissue cells that produce the extracellular matrix are called
EXTRACELLULAR MATRIX. The extracellular matrix of connective tissue is composed of ground substance and fibers. In ordinary connective tissue, the ground substanc e consists mainly of water. The principal fiber type is collagen (the most abundant protein in the body), with elastic fibers as a minor element.The extracellular materials which comprise the matrix are produced by fibroblasts.he extracellular fibers of connective tissue are traditionally classified into three types: 1  Collagen fibers confer main tensile strength, and are the stuff of scars. 2  Elastic fibers confer elasticity. 3  Reticular fibers (really, a special form of collagen) provide a delicate supporting framework for loose cells.