In avian and mammalian development, the functional equivalent of the amphibian blastopore is known as the:
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Correct answer: Primitive streak
The primitive streak is a linear band of epiblast cells that forms in the blastodisc of birds and mammals. Cells migrate through it to become mesoderm and endoderm, making it the functional equivalent of the amphibian blastopore.
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More Stages of Embryonic Development questions
- Which of the following tissues is NOT derived from the mesoderm?
- Which specific region of the mesoderm forms the somites, which eventually differentiate into vertebrae and segmental muscles?
- The 'Gray Crescent' in amphibian eggs is a region that predicts the location of:
- During gastrulation, the process where a sheet of cells folds inward into the blastocoel is called:
- The archenteron, formed during gastrulation, eventually develops into which adult structure?
- Which of the following is a characteristic of 'organogenesis'?