Mass of tissue that develops primarily from the mesoderm (i.e., the middle layer of the trilaminar germ disk) of an embryo. Viscous in consistency, mesenchyme contains collagen bundles and fibroblasts and later differentiates into blood vessels, blood‐related organs, and connective tissues.
Embryonic tissue that forms connective tissue, blood, and smooth muscles.
The undifferentiated tissue of the early embryo that forms almost entirely from mesoderm. It is loosely organized and the individual cells migrate to different parts of the body, where they form most of the skeletal and connective tissue, the blood and blood system, and the visceral (smooth) muscles.
A diffuse network of cells forming the embryonic mesoderm and giving rise to connective tissues, blood and blood vessels, the lymphatic system, and cells of the mononuclear phagocyte system.