Podcast
Questions and Answers
What is the embryonic area around the primitive streak referred to as?
What is the embryonic area around the primitive streak referred to as?
- Hensen's pit
- Primitive ridges
- Primitive groove (correct)
- Hensen's node
What is the shape of the area pellucida?
What is the shape of the area pellucida?
- Rectangular
- Pear-shaped (correct)
- Circular
- Oval
Which structure separates the neural plate from the primitive streak?
Which structure separates the neural plate from the primitive streak?
- Proamnion
- Hensen's node (correct)
- Notochord
- Area opaca
What is the space between the head and the blastoderm known as?
What is the space between the head and the blastoderm known as?
At what stage does the cephalic region project free from the blastoderm for a considerable distance?
At what stage does the cephalic region project free from the blastoderm for a considerable distance?
What is the region opposite to the caudal end of the embryo called?
What is the region opposite to the caudal end of the embryo called?
At what stage is the primitive streak not yet visible in the chick embryo?
At what stage is the primitive streak not yet visible in the chick embryo?
What is present in the part of area pellucida and marks the posterior end of the embryo?
What is present in the part of area pellucida and marks the posterior end of the embryo?
What forms the roof of the subgerminal cavity in the chick embryo?
What forms the roof of the subgerminal cavity in the chick embryo?
At approximately how many hours after incubation is the head process stage of the chick embryo?
At approximately how many hours after incubation is the head process stage of the chick embryo?
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.
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Description
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.
