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  Encyclopedia of Keywords > Medicine > Anatomy > Tissues > Endoderm > Germ Layers   Michael Charnine

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  1. Germ layers are the primary tissue layers in an animal, defined as groups of cells. (Web site)
  2. Germ layers are only really pronounced in the vertebrates. (Web site)
  3. Germ layers are nearly universal in animals. (Web site)
  4. The germ layers are referred to as the ectoderm, mesoderm and endoderm. (Web site)
  5. The three germ layers are the ectoderm, the endoderm, and the mesoderm; all tissues and organs develop from these. (Web site)

Three Different Layers

  1. Germ layers -Fertilization of an egg stimulates cell division, and the resulting cells are organized into three different layers, called germ layers.


  1. Protostomes are bilaterally symmetrical, have three germ layers, the organ level of organization, the tube-within-a-tube body plan, and a true coelom. (Web site)


  1. The germ layers also are important to differentiate organisms known as protostomes and deuterostomes. (Web site)

Studying Chick Embryos

  1. Later, Heinz Christian Pander discovered germ layers while studying chick embryos. (Web site)

Adult Structures

  1. All the adult structures develop from these germ layers.
  2. As a result, the tympanic membrane is one of very few adult structures that is derived from all three germ layers.

Gastrula Stage

  1. Characteristics of eumetazoans include true tissues organized into germ layers, and an embryo that goes through a gastrula stage. (Web site)
  2. At the gastrula stage, students should make a new model that now contains three colors of clay (to represent the three germ layers). (Web site)

Three Different Germ Layers

  1. These animals have a body composed of three different germ layers, called the endoderm, mesoderm, and ectoderm.


  1. Endoderm, (sometimes called Entoderm) is one of the germ layers formed during animal embryogenesis.

Bilateral Symmetry

  1. Together with the deuterostomes and a few smaller phyla, they make up the Bilateria, mostly comprising animals with bilateral symmetry and three germ layers.
  2. In the discussion of the origins of germ layers and of bilateral symmetry, it occurs to me that another fundamental issue is only briefly touched upon.

Three Embryonic Germ Layers

  1. The following description concerns gastrulation in echinoderms, representative of the triploblasts, or animals with three embryonic germ layers.
  2. This is because the teratomas contain cells derived from each of the three embryonic germ layers.
  3. Teratoma —A tumor composed of tissues from the three embryonic germ layers.

Three Primary Germ Layers

  1. From the three primary germ layers, the organs and tissues develop. (Web site)


  1. That should be easy to figure out at this point: two germ layers.


  1. The purpose of gastrulation is to position the three embryonic germ layers, the endoderm, ectoderm and mesoderm. (Web site)
  2. However, the position and arrangement of the germ layers are highly species-specific, depending on the type of embryo produced.


  1. Cite This Source Science Dictionary ectoderm (ěk'tə-dûrm') Pronunciation Key The outermost of the primary germ layers of an animal embryo. (Web site)


  1. B. Development of germ layers as 2-dimensional sheets upon mass of passive yolk. (Web site)
  2. The next event of the preembryonic stage is the development of primary germ layers during the second week of development.


  1. For many mammals, it is sometime during formation of the germ layers that implantation of the embryo in the uterus of the mother occurs.

Second Phase

  1. In the second phase, at post-gastrula stages, Bmp serves to pattern the germ layers in Drosophila and chordates [ 10 ].
  2. Nonetheless hemichordates use the Bmp-Chordin axis for a second phase, the “morphogenetic phase” for patterning the three germ layers.

Neural Tube

  1. Then we will discuss the neural tube, which develops from one of these germ layers and eventually develops into a brain.


  1. Fig. 4. Gastrulation is the process by which cells of the blastoderm produce the three primary germ layers (Ettensohn, 2001).
  2. Lower Cross Section shows the three germ layers formed by the process of gastrulation.


  1. Further differentiation of the primary germ layers will produce the major tissue types. (Web site)

Cell Types

  1. Furthermore, these cells could differentiate into cell types of the three germ layers in vitro and in teratomas.
  2. Embryoid bodies contain cell types derived from all 3 germ layers.
  3. This is shown by differentiating these stem cells into cell types of the three different germ layers. (Web site)


  1. ES cells are pluripotent and give rise during development to all derivatives of the three primary germ layers: ectoderm, endoderm and mesoderm. (Web site)
  2. In later life, remnant of primitive streak may give rise to peculiar tumours that contain tissues derived from all three germ layers. (Web site)
  3. The middle of three germ layers that gives rise later in development to such tissues as muscle, bone, and blood.


  1. All animals more complex than sponges produce two or three primary germ layers (primary tissue layers). (Web site)


  1. The outermost of the three primary germ layers of an embryo, from which the epidermis, nervous tissue, and, in vertebrates, sense organs develop. (Web site)


  1. The purpose of gastrulation is to position the 3 embryonic germ layers, the endoderm, ectoderm and mesoderm.

Three Layers

  1. The three layers produced by gastrulation are embryonic tissues called embryonic germ layers. (Web site)

Xenopus Laevis

  1. In this review, we summarise the recent advances in our understanding of the formation of the germ layers in Xenopus laevis. (Web site)

Inner Cell Mass

  1. Epiblast Cells: From inner cell mass, will ultimately give rise to the three germ layers and the entire embryo. (Web site)
  2. Three principal laminae, known as the primary germ layers, develop from the inner cell mass by about two weeks after fertilization. (Web site)

Organ Systems

  1. Fate of Germinal Layers in Embryonic Development The 3 germ layers give rise to definite organs and organ systems. (Web site)
  2. All three germ layers participate in formation of the functional organs and organ systems. (Web site)


  1. Gastrulation is followed by organogenesis, when individual organs develop within the newly formed germ layers. (Web site)
  2. Before histogenesis and organogenesis the primitive embryonic structures have been already formed: germ layers, neural tube, notochord, coeloms, somites. (Web site)
  3. Various regions of the three embryonic germ layers develop into the rudiments of organs during the process of organogenesis. (Web site)

Three Germ Layers

  1. All the more complex animals (from flat worms to man) are triploblastic with three germ layers (a mesoderm as well as ectoderm and endoderm).
  2. The epiblast, now called primitive ectoderm will give rise to all three germ layers of the embryo: ectoderm, mesoderm, and endoderm.
  3. During development, they make three germ layers: the endoderm, ectoderm, and the mesoderm (between ecto- and endoderm).


  1. The endoderm, sometimes refered to as entoderm, is one of the three germ layers of the developing embryo, the other two being the ectoderm and the mesoderm. (Web site)
  2. The tissues studied were derived from the three germ layers of the early embryo: endoderm (liver), mesoderm (kidney), and ectoderm (brain).
  3. Like other metazoa, gastrulation leads to the formation of three germ layers; the endoderm, mesoderm, and ectoderm. (Web site)


  1. The Three Germ Layers: These are three different tissue types that exist during development in the embryo and that, together, will later make up the body. (Web site)
  2. Together, the three layers are called the primary germ layers, since they originate all organs in the body.
  3. These isolated cells can turn into cells representative of the three germ layers, all the mature cell types of the body. (Web site)


  1. As organogenesis progresses, morphogenesis and cell differentiation refine the organs that form from the three germ layers. (Web site)


  1. As the neural folds close, most neural crest cells change into mesenchyme, an embryonic tissue that consists of star-shaped cells from all three germ layers. (Web site)
  2. Mesenchyme Tissue: Connective tissue from all three germ layers in the embryo. (Web site)


  1. Highlights (continue) Embryonic disc = • the cells of the inner cell mass multiply, and arranged to form an embryonic disc having two germ layers. (Web site)
  2. The cells of germ layers differentiate to form different organ systems (organogenesis). (Web site)
  3. The embryoblast gives rise to the three germ layers from which all the cells and tissues of the human will arise.


  1. As the embryo develops, these germ layers give rise to the tissues and organs of the embryo.
  2. These germ layers interact to form all tissues and organs of the developing embryo. (Web site)
  3. The germ layers of sponges are loose federations of cells, which are not really tissues because the cells are relatively unspecialized. (Web site)


  1. Germ layers will eventually give rise to all of an animal’s Tissues and Organ s through a process called Organogenesis.
  2. An early period of rapid embryo nic development in which the organ s take form from the primary germ layers.


  1. Ectoderm, mesoderm and endoderm are the three germ layers from which all cells, tissues and organs develop (see Figure 2). (Web site)
  2. Germ layers will eventually give rise to all of an animal’s tissues and organs through a process called organogenesis.
  3. All tissues and organs of the body develop from three germ layers known as the ectoderm, the mesoderm, and the endoderm. (Web site)


  1. There are two or three germ layers: an outer layer (see ectoderm), an inner layer (see endoderm), and in most animal groups a middle layer (see mesoderm). (Web site)
  2. The outer of the three germ layers of the embryo (the other two being mesoderm and endoderm). (Web site)


  1. The ectoderm is outermost of the three germ layers of the developing embryo, the other two being the mesoderm and the endoderm. (Web site)
  2. Ectoderm The ectoderm is the primary germ layer which emerges first during embryogenesis and forms from the outermost of the germ layers. (Web site)
  3. One of three basic tissue types in the early embryo that forms from the outermost of the germ layers. (Web site)


  1. All higher animals (from flatworms to man) are triploblastic, possessing a mesoderm in addition to the germ layers found in diploblasts. (Web site)
  2. Flatworms are unsegmented, bilaterally symmetrical worms that lack a coelom (acoelomate) but that do have three germ layers. (Web site)
  3. Flatworms are the most primitive organisms in which we find all three germ layers: ectoderm, mesoderm, and endoderm. (Web site)


  1. Animals with two germ layers are called diploblastic while those with three are called triploblastic. (Web site)
  2. More generally, the mesoderm is one of the three germ layers found in the embryos of animals more complex than cnidarians, making them triploblastic.
  3. The illustration, however, depicts the gastrulation of a diploblast, animals with two germ layers. (Web site)


  1. During gastrulation cells migrate to the interior of the blastula, consequently forming two (in diploblastic animals) or three (triploblastic) germ layers.
  2. After induction of the germ layers, the blastula is transformed by gastrulation movements into a multilayered embryo with head, trunk and tail rudiments.
  3. Triploblasty is a condition of the blastula in which there are three primary germ layers: the ectoderm, mesoderm, and endoderm.


  1. The mesoderm is one of the three germ layers in the early developing embryo, the other two layers being the ectoderm and the endoderm. (Web site)
  2. Germ Layers The embryonic tissue layers formed during developmental stages in Eumetazoa, are called germ layers.
  3. These layers are also called the germ layers, with "germ" in the sense of a source or starting point, as in the word "germination".


  1. Gastrulation of a diploblast: The formation of germ layers from a (1) blastula to a (2) gastrula. (Web site)
  2. Other than sponges, animals develop two or three germ layers during gastrulation (development of the embryo from the blastula to a gastrula). (Web site)
  3. This early embryonic form undergoes gastrulation, forming a gastrula with either two or three layers (the germ layers).


  1. Medicine > Anatomy > Tissues > Endoderm
  2. Medicine > Anatomy > Tissues > Ectoderm
  3. Medicine > Anatomy > Tissues > Mesoderm
  4. Nature > Life > Animals > Embryo
  5. Nature > Life > Animals > Gastrulation

Related Keywords

    * Ectoderm * Embryo * Endoderm * Mesoderm
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  Originally created: April 04, 2011.
  Links checked: July 22, 2013.
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