Mesenchyme (also known as embryonic connective tissue) is the mass of tissue that develops mainly from the mesoderm (the middle layer of the trilaminar germ disc) of an embryo. Viscous in consistency, mesenchyme contains collagen bundles and fibroblasts. Mesenchyme later differentiates into blood vessels, blood-related organs, and connective tissues. Biological tissue is any substance made up of cells that perform a similar function within an organism. ... It has been suggested that organogenesis be merged into this article or section. ... Embryos (and one tadpole) of the wrinkled frog (Rana rugosa). ... Tropocollagen triple helix. ... A fibroblast is a cell that makes the structural fibers and ground substance of connective tissue. ... The arterial system The blood vessels are part of the circulatory system and function to transport blood throughout the body. ...

Embryonic connective tissue (mesenchyme):

• Derives from the embryonic mesoderm
• Consists of loosely-packed, unspecialized cells set in a gelatinous extracellular matrix
• Develops into other types of tissues: connective, bone, cartilage
• Develops into other types of structures and systems: blood cells, endothelial cells, smooth muscle cells, circulatory system, lymphatic system.

All organs in the body contain mesenchyme. For example, "Splany mesenchyme Mesoderm" of midgut. - malteser Embryos (and one tadpole) of the wrinkled frog (Rana rugosa). ... The mesoderm is one of the three germ layers in the early developing embryo, the other two layers being the ectoderm and the endoderm. ... In biology, extracellular matrix (ECM) is any material part of a tissue that is not part of any cell. ... Biological tissue is any substance made up of cells that perform a similar function within an organism. ... Connective tissue is any type of biological tissue with an extensive extracellular matrix and often serves to support, bind together, and protect organs. ... Grays illustration of a human femur, a typically recognized bone. ... Cartilage is a type of dense connective tissue. ... A blood cell is any cell of any type normally found in blood. ... The endothelium is the layer of thin, flat cells that lines the interior surface of blood vessels, forming an interface between circulating blood in the lumen and the rest of the vessel wall. ... Smooth muscle is a type of non-striated muscle, found within the walls of hollow organs; such as blood vessels, bladders, uteri. ... A circulatory system (sometimes cardiovascular system) is an organ system that moves substances to and from cells; it can also help stabilize body temperature and pH (part of homeostasis). ... Lymph originates as blood plasma lost from the circulatory system, which leaks out into the surrounding tissues. ...