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The formation of an organ.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the formation and development of organs in animals. Ontogenetic organogenesis is studied through embryology and biology of development, while phylogenetic organogenesis is studied through comparative anatomy. These disciplines describe and analyze the processes of organogenesis and explain the phylogenetic and ontogenetic origins of the processes. Comparative anatomy examines the rise of new organs and the transformation, division, progressive development and reduction, and rudimentation of organs. Study of the development of the forms of organs in connection with organ function led to the discovery of the basic principles of phylogenetic organogenesis—differentiation (seeDIFFERENTIATION), integration (seeINTEGRATION), and change of function.

To a large extent, ontogenetic organogenesis repeats phylogenetic organogenesis (seeBIOGENETIC LAW). Successive differentiation and integration of organs and uneven growth and active migration of cellular material occur in the course of ontogenetic organogenesis. The forces that underlie ontogenetic organogenesis can be precisely studied, especially by experiment. (For initial and subsequent stages of organogenesis seeDETERMINATION, CLEAVAGE, EMBRYONIC DEVELOPMENT, GERM LAYERS, INDUCTORS, INDUCTION, ORGANIZER.)

With respect to plants, “organogenesis” usually refers to the ontogenetic formation and development of basic organs—roots, stem, leaves, and flowers—from undifferentiated tissue, or meristem (seeMERISTEM).

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
After that each pregnant mouse was treated orally with 0.1 ml of respective dose at day 8 of gestation (organogenetic period).
Mercier et al (2003), evaluating the in vitro organogenetic response of pineapple leaves in medium without the supplementation of plant regulators, verified that the endogenous balance of auxin and cytokinin in the third day of cultivation reduced, whereas at 15, a similar balance occurred between the control group and the medium supplemented with plant regulators, which could only have happened by the endogenous synthesis of these regulators.
All these events occur at advanced organogenetic stages during the embryonic-larval transition period, suggesting the presence of osmoregulatory mechanisms at early stages of amphibian development, even when the specific structures are not fully developed.
Expression profiles of 22 novel molecular markers for organogenetic pathways acting in alfalfa nodule development.