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Yolk Sac: The first of four extra-embryonic membranes to form during Embryogenesis. In Reptiles and Birds, it arises from endoderm and mesoderm to incorporate the Egg yolk into the Digestive tract for nourishing the embryo. In placental Mammals, its nutritional function is vestigial; however, it is the source of Intestinal mucosa; Blood cells; and Germ cells. It is sometimes called the vitelline sac, which should not be confused with the Vitelline membrane of the egg.
 JoVE Developmental Biology

Isolation of Murine Embryonic Hemogenic Endothelial Cells

1Departments of Medicine, Genetics and Biomedical Engineering, Yale Cardiovascular Research Center, Vascular Biology and Therapeutics Program, Yale Stem Cell Center, Yale University School of Medicine, 2Department of Pediatrics, Section of Neonatal-Perinatal Medicine, Yale University School of Medicine, 3Department of Molecular and Cellular Biology, Baylor College of Medicine


JoVE 54150

 JoVE Developmental Biology

Generation of Parabiotic Zebrafish Embryos by Surgical Fusion of Developing Blastulae

1Division of Hematology/Oncology, Boston Children’s Hospital, 2Harvard Medical School, 3Division of Hematology, Department of Medicine, Brigham and Women’s Hospital, 4Harvard Stem Cell Institute, 5Broad Institute of Massachusetts Institute of Technology, 6Howard Hughes Medical Institute, 7Division of Hematologic Malignancies, Dana-Farber Cancer Institute


JoVE 54168

 JoVE Medicine

A Novel Surgical Approach for Intratracheal Administration of Bioactive Agents in a Fetal Mouse Model

1Molecular Virology and Gene Therapy, KU Leuven, 2Department of Woman and Child, KU Leuven, 3Neurobiology and Gene Therapy, KU Leuven, 4Division of Nuclear Medicine, KU Leuven, 5Biomedical NMR Unit/ MoSAIC, KU Leuven


JoVE 4219

 JoVE Developmental Biology

Analysis of Zebrafish Larvae Skeletal Muscle Integrity with Evans Blue Dye

1Program in Genetics & Genome Biology, The Hospital for Sick Children, 2Department of Molecular Genetics, The University of Toronto, 3Program in Genomics of Differentiation, Eunice Kennedy Shriver National Institute of Child Health and Human Development, 4Departments of Pediatrics and Neurology, University of Michigan


JoVE 53183

 Science Education: Essentials of Biology 2

Development of the Chick

JoVE Science Education

The chicken embryo (Gallus gallus domesticus) provides an economical and accessible model for developmental biology research. Chicks develop rapidly and are amenable to genetic and physiological manipulations, allowing researchers to investigate developmental pathways down to the cell and molecular levels.

This video review of chick development begins by describing the process of egg fertilization and formation within the chicken reproductive tract. Next, the most commonly used chick staging nomenclature, the Hamburger Hamilton staging series, is introduced. Major events in chick development are then outlined, including the dramatic cellular movements known as gastrulation that form the three major cell layers: The ectoderm, mesoderm, and endoderm. Cells from these layers go on to generate all the tissues within the organism, as well as extraembryonic membranes, which are necessary for the transport of gases, nutrients, and wastes within the eggshell. To conclude the discussion, some exciting techniques will be presented as strategies for studying chick development in greater detail.

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