10 Questions
What is the embryonic area around the primitive streak referred to as?
Primitive groove
What is the shape of the area pellucida?
Pear-shaped
Which structure separates the neural plate from the primitive streak?
Hensen's node
What is the space between the head and the blastoderm known as?
Subcephalic pocket
At what stage does the cephalic region project free from the blastoderm for a considerable distance?
28 Hours Stage
What is the region opposite to the caudal end of the embryo called?
Cephalic end
At what stage is the primitive streak not yet visible in the chick embryo?
Prestreak stage
What is present in the part of area pellucida and marks the posterior end of the embryo?
Embryonic shield
What forms the roof of the subgerminal cavity in the chick embryo?
Area pellucida
At approximately how many hours after incubation is the head process stage of the chick embryo?
18 hours
Study Notes
Embryonic Development in Chick Embryos
- The embryonic area around the primitive streak is referred to as the gastrula.
Area Pellucida
- The area pellucida is circular in shape.
Neural Plate and Primitive Streak
- The mesoderm separates the neural plate from the primitive streak.
Head and Blastoderm
- The space between the head and the blastoderm is known as the subgerminal cavity.
Developmental Stages
- The cephalic region projects free from the blastoderm for a considerable distance at the head process stage.
- The head process stage occurs approximately 18-19 hours after incubation.
- The primitive streak is not yet visible in the chick embryo at the gastrula stage.
Embryonic Regions
- The region opposite to the caudal end of the embryo is called the cephalic end.
Posterior End of the Embryo
- The primitive streak is present in the part of area pellucida and marks the posterior end of the embryo.
Subgerminal Cavity
- The hypoblast forms the roof of the subgerminal cavity in the chick embryo.
Test your knowledge of the embryology of chick embryos at the prestreak stage. This quiz covers the antero-posterior lengthening, primitive streak formation, and differentiation of the blastoderm.
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