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The matrix of acetabular cartilage samples was filled with regularly or irregularly oriented collagenous fibers (pink), whereby some demonstrated scattered spindle-shaped fibroblasts (nuclei stained blue).
Between these two cellular layers is the gelatinous coenenchyme--equivalent to the cnidarian mesoglea--containing thin-walled gastrodermal canals termed solenia, calcite sclerites, and some collagenous fibers (Fabricius and Alderslade, 2001).
The connective tissue or stroma of the endometrium is a "cellular" type with masses of branching fibroblasts resembling mesenchymal cells held in a meshwork of reticular fibers and fine collagenous fibers.