Chick Embryo

Cards (29)

  • Living part of the chicken egg
    Blastoderm
  • The blastoderm is surrounded by the area pellucida and area opaca
  • Transparent portion of the embryo
    Area pellucida
  • Darker portion of the embryo, where extra embryonic blood vessels are forming
    Area opaca
  • The primitive streak is a clear line flanked by parallel dark lines toward the center of the area pellucida
  • Groove between 2 primitive folds
    Primitive groove
  • 2 ectodermal elevations
    Primitive folds
  • Deep anterior pit where groove terminates
    Hensen's node
  • The notochord is a slightly darkened triangular area anterior to the Hensen's node
  • Formed throughout the area opaca, irregularly shaped accumulations of mesodermal cells
    Blood islands
  • Will form the blood vessels and primitive blood cells
    Blood islands
  • In how many hours will the somites be present?
    ~ 21
  • In this stage, the specimen is divisible into an inner area pellucida and an outer area opaca
    33 Hour Chick Embryo
  • Clear area anterior to the head of the embryo
    Proamnion
  • Biggest difference between 48 hour and 33 hour chick embryo
    Cephalic flexure
  • In the 48 hour chick embryo, there are now optic cups and about 20 to 28 somites
  • After 72 hours, the chick embryo will now have:
    1. Limb buds
    2. Tail
    3. Paired wing
    4. Sac-like allantois
  • The allantois acts as an embryonic lung
  • Day 1
    • Head fold formation
    • Hensen's node regression
    • Separation of embryo from extraembryonic tissue
  • Day 2
    • Blood islands
    • Heart primordium
    • Closing of neural tube
  • Day 3
    • Start of blood circulation
    • Appearance of extraembryonic fold
  • Day 4
    • Limb bud and allantoic vesicle formation
    Day 9
    • C-shaped embryo
    • Appearance of claws
    • Budding of first feather follicles
  • The ff image shows the blastodisc:
  • Single reproductive cell
    Blastodisc
  • Four membranes of the amniotic egg:
    1. Chorion
    2. Amnion
    3. Yolk sac
    4. Allantois
  • Encases the embryo in a fluid-filled cavity
    Amnion
  • Blood vessel formation is attributed to:
    1. Vasculogenesis
    2. Angiogenesis
  • Branch point density =
    branch points in a blood vessel segment / length of a blood vessel segment
  • Distance between each branch point
    Intercapillary distance