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Mesenchyme (/ ˈmɛsənkaɪm ˈmiːzən -/ [1]) is a type of loosely organized animal embryonic connective tissue of undifferentiated cells that give rise to most tissues, such as skin, blood or bone. [2][3] The interactions between mesenchyme and epithelium help to form nearly every organ in the developing embryo. [4]
Definition. Mesenchymal stem cells (MSCs), a term first named (1991) by Arnold Caplan at Case Western Reserve University, [5] are characterized morphologically by a small cell body with a few cell processes that are long and thin. While the terms mesenchymal stem cell (MSC) and marrow stromal cell have been used interchangeably for many years ...
The epithelial–mesenchymal transition (EMT) is a process by which epithelial cells lose their cell polarity and cell–cell adhesion, and gain migratory and invasive properties to become mesenchymal stem cells; these are multipotent stromal cells that can differentiate into a variety of cell types. EMT is essential for numerous developmental ...
69072. Anatomical terminology. [edit on Wikidata] The mesoderm is the middle layer of the three germ layers that develops during gastrulation in the very early development of the embryo of most animals. The outer layer is the ectoderm, and the inner layer is the endoderm. [1][2] The mesoderm forms mesenchyme, mesothelium and coelomocytes.
Septum transversum. Diaphragm of embryo. Liver with the septum transversum. Human embryo 3 mm. long. The septum transversum is a thick mass of cranial mesenchyme, formed in the embryo, that gives rise to parts of the thoracic diaphragm and the ventral mesentery of the foregut in the developed human being and other mammals.
Septum between heart tubes. In the anatomy of an embryo, the splanchnopleuric mesenchyme is a structure created during embryogenesis when the lateral mesodermal germ layer splits into two layers. The inner (or splanchnic) layer adheres to the endoderm, and with it forms the splanchnopleure (mesoderm external to the coelom plus the endoderm).
The limb bud is a structure formed early in vertebrate limb development. As a result of interactions between the ectoderm and underlying mesoderm, formation occurs roughly around the fourth week of development. [1] In the development of the human embryo the upper limb bud appears in the third week and the lower limb bud appears four days later. [2]
Somite. Transverse section of half of a chick embryo of forty-five hours' incubation. The dorsal (back) surface of the embryo is towards the top of this page, while the ventral (front) surface is towards the bottom. Dorsum of human embryo, 2.11 mm in length. (The older term primitive segments is used to identify the somites.)