T. Clark Brelje, Ph.D.
University of Minnesota
Department of Genetics, Cell Biology and Development
6-160 Jackson Hall
321 Church St SE
Minneapolis, MN 55455
Robert L. Sorenson, Ph.D.
University of Minnesota
Department of Genetics, Cell Biology and Development
6-160 Jackson Hall
321 Church St SE
Minneapolis, MN 55455
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The umbilical cord connects the developing fetus and the placenta. It consists mostly of mesenchyme (embryonic connective tissue). Its bluish-pink color is from ground substance (blue) and sparse collagen fibers (pink).
Fibroblasts produced this extracellular matrix and are dispersed in the connective tissue. Only their nuclei can be identified. Some appear round with heterochromatin, while others are flattened with mostly euchromatin. This suggests some of the fibroblasts are active, while others are inactive.