Histogenesis is defined as "the formation of tissues and organs from undifferentiated cells" (Encarta Dictionary). A biological tissue is a group of biological cells that perform a similar function. ... An organ is the following: In anatomy, an organ is a group of tissues which perform some function. ... A cell is a single unit or compartment, enclosed by a border or wall. ...
Primary Germ Layers
The Primary Germ Layers form the tissues and ultimately organs of a fetus. The innermost layer of this set is the endoderm. The middle layer is termed the mesoderm, and the outermost layer is called the ectoderm. Each of these layers are responsible for the production of certain tissues and organs. Fetus at eight weeks A fetus (alternatively foetus or fÅtus) is an unborn vertebrate offspring after the embryonary stage. ... The endoderm is one of the three germ layers of the developing embryo, the other two being the ectoderm and the mesoderm. ... Mesoderm is one of the three germ layers in the early developing embryo, the other two layers being the ectoderm and the endoderm. ... The ectoderm is outermost of the three germ layers of the developing embryo, the other two being the mesoderm and the endoderm. ...
--EinsteinMC2 21:22, 12 August 2005 (UTC) The heart and lungs (from an older edition of Grays Anatomy) The lung is an organ belonging to the respiratory system and interfacing to the circulatory system of air-breathing vertebrates. ... Kidneys viewed from behind with spine removed The kidneys are bean-shaped excretory organs in vertebrates. ... A gland is an organ in an animals body that synthesizes a substance for release such as hormones, often into the bloodstream (endocrine gland) or into cavities inside the body or its outer surface (exocrine gland). ... The dermis is the the layer of skin beneath the epidermis, that consists of connective tissue and cushions the body from stress and strain. ... It has been suggested that Circulation (physiology) be merged into this article or section. ... Structure of a skeletal muscle Muscle is one of the four tissue types. ... This article is about the musical instrument. ... Epidermis could refer to: In plants, the outermost layer of cells covering the leaves and young parts of a plant, see plant dermal tissue system. ... This article refers to the sight organ. ... In the anatomy of animals, the brain, or encephalon, is the supervisory center of the nervous system. ... For the Physics term GUT, please refer to Grand unification theory The gastrointestinal or digestive tract, also referred to as the GI tract or the alimentary canal or the gut, is the system of organs within multicellular animals which takes in food, digests it to extract energy and nutrients, and...
The cell of origin (histogenesis) for KS still remains controversial.
The histogenesis of these spindle cells, however, is still undefined.
Two methods have been developed to study the histogenesis and pathogenesis of KS: 1) the establishment of long-term cell cultures derived from KS lesions; and 2) the development nude mice into which cultured KS-derived cells are injected.
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