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In the embryo the place of fibrous tissues is at first occupied by a mass of roundish cells, derived from the mesoblast. These develop into a network of branched cells or into groups of fusiform cells. Shown is a portion of submucous tissue of a uterus during pregnancy. Labels: a, branched cells, more or less spindel-shaped; b, bundles of connective tissue.

Tissue Growth of the Uterus

In the embryo the place of fibrous tissues is at first occupied by a mass of roundish cells, derived…