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Related Concept Videos

Development of the Sexual Organs in the Embryo and Fetus01:15

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Development of the reproductive organs in an embryo starts from a bipotential state. This means the early embryo can develop either male or female reproductive organs. The formation of these organs begins with the growth of gonadal ridges that arise from the intermediate mesoderm during the fifth week of development.
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Cleavage and Blastulation01:33

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After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube. Cleavage is a mitotic cell division that does not result in growth. With each round of successive cell division, daughter cells get increasingly smaller.
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Gastrulation01:56

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Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata...
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Determination01:51

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During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In...
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The development of all multicellular organisms starts with the fusion of haploid cells called sperm and egg to form a diploid zygote. A zygote is a totipotent cell that can develop into a complete organism. The zygote undergoes cell division or cleavage to form an 8-cell mass. Until this stage, the cells are spherical, loosely attached, and remain totipotent. Totipotent cells are capable of developing both the embryonic and the extraembryonic tissues. However, as they continue to divide, they...
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The development of the vascular system in a fetus is a complex and intricate process that begins as early as 15 to 16 days post-conception. This process starts outside the embryo, specifically in the mesoderm of the yolk sac, chorion, and connecting stalk. Approximately two days later, the formation of blood vessels occurs within the embryo itself.
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Related Experiment Video

Updated: Jul 4, 2025

Single Cell Collection of Trophoblast Cells in Peri-implantation Stage Human Embryos
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Single Cell Collection of Trophoblast Cells in Peri-implantation Stage Human Embryos

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Why study human embryo development?

Janet Rossant1

  • 1The Gairdner Foundation and the Hospital for Sick Children, University of Toronto, MaRS Centre, Heritage Building, 101 College Street, Suite 335, Toronto, Ontario, M5G 1L7, Canada.

Developmental Biology
|February 7, 2024
PubMed
Summary
This summary is machine-generated.

Researchers are exploring early human embryo development using advanced culture systems and stem cell models. These methods offer insights into developmental biology and clinical issues, despite ethical and access challenges.

Keywords:
AmnionEmbryo modelsEpiblastGastrulationHuman embryoHypoblastPlacental developmentStem cellsTrophoblast

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Area of Science:

  • Developmental Biology
  • Stem Cell Biology
  • Reproductive Medicine

Background:

  • Early human embryo development is crucial for understanding pregnancy loss, congenital anomalies, and adult diseases.
  • Research in this field provides fundamental insights into human biology.
  • Comparing human and mouse development is key, but human embryo access is limited.

Purpose of the Study:

  • To investigate the processes and mechanisms of early human embryo development.
  • To explore the potential of stem cell-derived models for studying early postimplantation development.
  • To address limitations in human embryo research, including restricted access and ethical concerns.

Main Methods:

  • Utilizing improved preimplantation embryo culture systems.
  • Employing single-cell genomics and live imaging techniques.
  • Developing and utilizing stem cell-derived models of human development.

Main Results:

  • New insights into human and mouse developmental similarities and differences are emerging.
  • Stem cell models offer a scalable approach to study early postimplantation stages.
  • Current stem cell models are not complete replicas of normal development.

Conclusions:

  • Advanced culture systems and stem cell models are vital tools for studying early human development.
  • These models can overcome limitations associated with human embryo research.
  • Further technological advancements and ethical/regulatory resolutions are needed for future progress.