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Related Concept Videos

Fertilization01:38

Fertilization

During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
Cleavage and Blastulation01:33

Cleavage and Blastulation

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.
Gastrulation01:56

Gastrulation

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 will form...

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An ex-ovo Chicken Embryo Culture System Suitable for Imaging and Microsurgery Applications
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An ex-ovo Chicken Embryo Culture System Suitable for Imaging and Microsurgery Applications

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Fertilization and early embryonic development in poultry

R Bellairs1

  • 1Department of Anatomy and Developmental Biology, University College London, England.

Poultry Science
|May 1, 1993
PubMed
Summary

Early bird embryo development is controlled by gravity and the primitive streak. Gravity influences initial polarity, while the primitive streak organizes cell movement and tissue patterning.

Area of Science:

  • Developmental biology
  • Embryology
  • Cell biology

Background:

  • Early embryonic development in birds is a complex process.
  • Understanding the initial organizational forces is crucial for developmental biology.

Purpose of the Study:

  • To identify the primary controllers of early bird embryo development.
  • To elucidate the roles of gravity and the primitive streak in establishing embryonic patterns.

Main Methods:

  • This study is based on existing biological principles and observations.
  • Analysis of established knowledge on avian embryogenesis.

Main Results:

  • Gravity, likely via yolk distribution, establishes initial embryonic polarity.

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  • The primitive streak directs cell ingression and patterns developing tissues.

    • Conclusions:

    • Gravity and the primitive streak are key regulators of early avian development.
    • These factors work sequentially to establish fundamental embryonic structures.