Embryogenesis of the chicks -------------اجنة 10
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Embryogenesis of the chicks -------------اجنة 10

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Embryogenesis of the chicks -------------اجنة 10 Embryogenesis of the chicks -------------اجنة 10 Presentation Transcript

  • Embryogenesis of the Chick The First 72 h Many of the embryonic images will be from: http://www.uoguelph.ca/zoology/devobio/dbindex.htm
  • Topics • Diapause • Gastrulation • Primitive Streak • Embryo @ 24 h • Embryo @48 h • Embryo @ 72 h • Hamburger-Hamilton Stages of Development
  • Diapause • Period of time between oviposition and incubation • Physical Egg Conditions, –Embryo & Cell Division –Storage Conditions –Turkey Eggs
  • Gastrulation in a Microlecithal Egg QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. Images from: http://www.uoguelph.ca/zoology/devobio/210labs/gastrulation1.html QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. blue=Ectoderm red=Mesoderm yellow=Endoderm AP=Animal Pole; VP=vegetal
  • Gastrulation in the Chicken
  • Gastrulation in the Chicken, cont.
  • Gastrulation in the Chicken, cont.
  • 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
  • Gastrulation in the Chicken, cont.
  • Epiblast gives rise to all 3 Germ Layers
  • 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 injection dye picked up by cells b. Radioisotope labeling of an embryo c. Transplantation of labeled blastoderm
  • Primary Embryonic Tissue Layers • What types of tissues and organs result from the formation of the Ectoderm; Mesoderm; and Ento/Endoderm?
  • 24 h Embryo
  • 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
  • 33 h Embryo
  • 48 h Embryo
  • 72 h Embryo 1 = Telencephalon 2 = Diencephalon 3 = Mesencephalon 4 = Metencephalon 5 = Myelencephalon * = Otic capsule ^ = Olfactory pit
  • Staging Embryos, Hamburger Hamilton Stages