Embryogenesis of the chicks -------------اجنة 10
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Transcript of Embryogenesis of the chicks -------------اجنة 10
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Embryogenesis of the ChickThe First 72 h
Many of the embryonic images will be from: http://www.uoguelph.ca/zoology/devobio/dbindex.htm
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Topics• Diapause• Gastrulation• Primitive Streak• Embryo @ 24 h• Embryo @48 h• Embryo @ 72 h• Hamburger-Hamilton Stages of
Development
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Diapause
• Period of time between oviposition and incubation
• Physical Egg Conditions, – Embryo & Cell Division
– Storage Conditions
– Turkey Eggs
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Gastrulation in a Microlecithal Egg
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Images from: http://www.uoguelph.ca/zoology/devobio/210labs/gastrulation1.html
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blue=Ectoderm red=Mesoderm yellow=Endoderm
AP=Animal Pole; VP=vegetal
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Gastrulation in the Chicken
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Gastrulation in the Chicken, cont.
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Gastrulation in the Chicken, cont.
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a. All embryonic layers originate from Epiblast
b. At gastrulation, cells from Epiblast migrate down between Epiblast & Hypoblast
c. Presumptive Mesodermal cells remain between Epiblast & Hypoblast
d. Presumptive Endoderm formed by cells migrating down into Hypoblast
Primary Germ layer Completion
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Gastrulation in the Chicken, cont.
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Epiblast gives rise to all 3 Germ Layers
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Where do Cells on the Surface of the Blastoderm end up (in Germ Layers)
Presumptive areas studied by;
1. Marking with Dye
a. India Ink injectiondye picked up by cells
b. Radioisotope labeling of an embryo
c. Transplantation of labeled blastoderm
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Primary Embryonic Tissue Layers
• What types of tissues and organs result from the formation of the Ectoderm; Mesoderm; and Ento/Endoderm?
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24 h Embryo
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33 h Developments• Erythrocytes form in extraembryonic mesoderm,
• Appear in patches, blood islets/islands (BI)
• BI’s caudal to the embryo
• Peripheral cells of BI aggregates form endothelium that constitute walls of the blood vessel
• Blood vessels constitute vitelline blood supply, extra vascular blood supply
• Heart formation is occurring
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33 h Embryo
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48 h Embryo
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72 h Embryo
1 = Telencephalon
2 = Diencephalon
3 = Mesencephalon
4 = Metencephalon
5 = Myelencephalon
* = Otic capsule
^ = Olfactory pit
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Staging Embryos,
Hamburger Hamilton Stages
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