blood island


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blood is·land

an aggregation of splanchnic mesodermal cells on the embryonic yolk sac, with the potentiality of forming vascular endothelium and primordial blood cells.
Synonym(s): blood islet

blood island

one of the clusters of mesodermal cells that proliferate on the outer surface of the embryonic yolk sac and give it a lumpy appearance.
A primitive mesenchymal tissue that develops into bone marrow and blood vessels

blood island

The early collections of cells in the embryo that give rise to blood and blood-forming organs later in life.
See also: island