mesenchyme

The part of the embryonic mesoderm, consisting of loosely packed, unspecialized cells set in a gelatinous ground substance, from which connective tissue, bone, cartilage, and the circulatory and lymphatic systems develop.

The tissue or substance of the mesoderm of some animals, as sponges.

In embryology, the whole or a portion of the middle germ-layer, or mesoblast, when this layer is not epithelial, but consists of stellate, loosely interconnected, or even disconnected cells like those seen in primitive forms of connective tissue.

That part of the mesoderm of an embryo that develops into connective tissue, bone, cartilage, etc.

mesodermal tissue that forms connective tissue and blood and smooth muscles