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. [ http://id.nlm.nih.gov/mesh/D005347 http://en.wikipedia.org/wiki/Fibroblast https://www.worldcat.org/search?q=bn%3A0517223651 ]