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  2. Animal embryonic development - Wikipedia

    en.wikipedia.org/wiki/Animal_embryonic_development

    Diagram of stages of embryo development to a larval and adult stage. In developmental biology, animal embryonic development, also known as animal embryogenesis, is the developmental stage of an animal embryo. Embryonic development starts with the fertilization of an egg cell (ovum) by a sperm cell (spermatozoon). [1]

  3. Embryo - Wikipedia

    en.wikipedia.org/wiki/Embryo

    An embryo is the initial stage of development for a multicellular organism.In organisms that reproduce sexually, embryonic development is the part of the life cycle that begins just after fertilization of the female egg cell by the male sperm cell.

  4. Embryology - Wikipedia

    en.wikipedia.org/wiki/Embryology

    1 - morula, 2 - blastula 1 - blastula, 2 - gastrula with blastopore; orange - ectoderm, red - endoderm. Embryology (from Greek ἔμβρυον, embryon, "the unborn, embryo"; and -λογία, -logia) is the branch of animal biology that studies the prenatal development of gametes (sex cells), fertilization, and development of embryos and fetuses.

  5. Mammalian embryogenesis - Wikipedia

    en.wikipedia.org/wiki/Mammalian_embryogenesis

    The difference between a mammalian embryo and an embryo of a lower chordate animal is evident starting from blastula stage. Due to that fact, the developing mammalian embryo at this stage is called a blastocyst, not a blastula, which is more generic term. There are also several other differences from embryogenesis in lower chordates.

  6. Developmental biology - Wikipedia

    en.wikipedia.org/wiki/Developmental_biology

    These cell divisions are usually rapid with no growth so the daughter cells are half the size of the mother cell and the whole embryo stays about the same size. They are called cleavage divisions. Mouse epiblast primordial germ cells (see Figure: "The initial stages of human embryogenesis") undergo extensive epigenetic reprogramming. [16]

  7. Glossary of developmental biology - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_developmental...

    An early form of the animal embryo generally consisting of a hollow sphere of cells (blastomeres) in a single layer (the blastoderm) surrounding a fluid-filled cavity (the blastocoel). [2] Mammalian embryos develop into a specialized blastula known as a blastocyst, containing a differentiated inner cell mass and trophectoderm. blastulation

  8. Polarity in embryogenesis - Wikipedia

    en.wikipedia.org/wiki/Polarity_in_embryogenesis

    The animal pole consists of small cells that divide rapidly, in contrast with the vegetal pole below it. In some cases, the animal pole is thought to differentiate into the later embryo itself, forming the three primary germ layers and participating in gastrulation.

  9. Egg - Wikipedia

    en.wikipedia.org/wiki/Egg

    In multicellular organisms, the zygote subsequently divides in an organised manner into smaller more specialised cells, so that this new individual develops into an embryo. In most animals, the embryo is the sessile initial stage of the individual life cycle, and is followed by the emergence (that is, the hatching) of a motile stage.