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The formation of an organ.



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).

References in periodicals archive ?
Coverage includes the developmental anatomy of reproductive organs; histology, cellular and molecular biology of reproductive organs; comparative reproductive physiology of domestic animals; transgenic animals; gender selection in mammalian semen and preimplantation embryos; artificial insemination; embryo transfer and in vitro fertilization; comparative cryobiology of preimplantation embryos; animal cloning; comparative placentation; pregnancy diagnostics in domestic animals; and ultra-sonography in small ruminant reproduction.
A precise description of the developmental anatomy of the facial nerve and associated ear structures, augmented by an appreciation of phylogenic history, has proven extremely helpful intraoperatively.
During a mid-20th-century period of increased experimental studies of ferns, some laboratories began to challenge traditional concepts of the developmental anatomy of fern sporophytes.
To understand PFO, we should have basic knowledge about developmental anatomy and physiological changes in circulation taking place after birth.
of Queensland, Australia) presents ten chapters discussing the classification and phylogeny of birds; anatomy of the testis and male reproductive tract; anatomy and evolution of copulatory structures; developmental anatomy of the female reproductive tract; endocrinology of reproduction; ovarian dynamics and follicle development; spermatogenesis and testicular cycles; structure and phylogeny of avian spermatozoa; testis size, sperm size, and sperm competition; and fertilization.

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