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  2. Implantation (embryology) - Wikipedia

    en.wikipedia.org/wiki/Implantation_(embryology)

    Diagram of stages of developing blastocyst in the human until implantation. There are two stages of migration involved in implantation, the first is the migration of the zygote, and the second is the migration of the trophoblast. [13] Fertilization of the oocyte, takes place in the ampulla of the fallopian tube.

  3. Blastocyst - Wikipedia

    en.wikipedia.org/wiki/Blastocyst

    Implantation is made possible through structural changes in both the blastocyst and endometrial wall. [21] The zona pellucida surrounding the blastocyst breaches, referred to as hatching . This removes the constraint on the physical size of the embryonic mass and exposes the outer cells of the blastocyst to the interior of the uterus.

  4. Blastulation - Wikipedia

    en.wikipedia.org/wiki/Blastulation

    In mammalian development, the blastula develops into the blastocyst with a differentiated inner cell mass and an outer trophectoderm. The blastula (from Greek βλαστός (blastos meaning sprout)) is a hollow sphere of cells known as blastomeres surrounding an inner fluid-filled cavity called the blastocoel.

  5. Bilaminar embryonic disc - Wikipedia

    en.wikipedia.org/wiki/Bilaminar_embryonic_disc

    Once the blastocyst is formed, it undergoes implantation into the endometrium. [4] During implantation the blastocyst, which contains the inner cell mass, undergoes cellular differentiation into the two layers of the bilaminar embryonic disc. One of which is the epiblast, also known as the primitive ectoderm.

  6. Human embryonic development - Wikipedia

    en.wikipedia.org/wiki/Human_embryonic_development

    The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus. The germinal stage takes around 10 days. [1] During this stage, the zygote divides in a process called cleavage. A blastocyst is then formed and implants in the uterus.

  7. Blastocoel - Wikipedia

    en.wikipedia.org/wiki/Blastocoel

    The blastocoel further expands and the inner cell mass becomes positioned on one side of the trophoblast cells forming a mammalian blastula, called a blastocyst. The axis formed by the inner cell mass and the blastocoel is the first axis of symmetry of mammalian embryo and determines its attachment point to the uterus.

  8. Embryo - Wikipedia

    en.wikipedia.org/wiki/Embryo

    Depending on the species, a blastula or blastocyst stage embryo can appear as a ball of cells on top of yolk, or as a hollow sphere of cells surrounding a middle cavity. [8] The embryo's cells continue to divide and increase in number, while molecules within the cells such as RNAs and proteins actively promote key developmental processes such ...

  9. Trophoblast - Wikipedia

    en.wikipedia.org/wiki/Trophoblast

    The trophoblast (from Greek trephein: to feed; and blastos: germinator) is the outer layer of cells of the blastocyst. Trophoblasts are present four days after fertilization in humans. [1] They provide nutrients to the embryo and develop into a large part of the placenta.