The human body has four basic categories of tissues: epithelial, connective, muscular and neural tissues. Among them, connective tissues can be subdivided into general, specific and embryonic connective tissues. Mesenchymal tissues belong to embryonic connective tissues and have multiple differentiation potential. Mesenchymal tissues play a role in the embryo in supporting, filling and forming new tissues and organs. In humans and adult animals, mesenchymal tissue is often retained in its primitive state and can differentiate into new tissues when needed. Mesenchymal tissues include connective tissue, fat, muscle, vasculature, bone, cartilage, lymphatic tissue, and hematopoietic tissue. Mesenchymal cells are representative of embryonic connective tissue and are mainly derived from mesodermal cells during the embryonic period, but can also be differentiated from ectodermal cells. Mesenchymal cells are poorly differentiated and have the ability to differentiate into many different cells.