fibroblast NCIt:C12482 A connective-tissue cell of mesenchymal origin that secretes proteins and especially molecular collagen from which the extracellular fibrillar matrix of connective tissue forms. A large, flat, oval cell found in connective tissue and responsible for the formation of fibers. A connective tissue cell which secretes an extracellular matrix rich in collagen and other macromolecules. Flattened and irregular in outline with branching processes; appear fusiform or spindle-shaped. SNOMEDCT:52547004 Tomasz Adamusiak A connective tissue cell which secretes an extracellular matrix rich in collagen and other macromolecules. James Malone NIFSTD:nlx_cell_20090201 cell type