16 Questions
During gastrulation, what is the primitive streak?
A thickened axial band of cells in the caudal half of the embryo
What is the process of delamination during gastrulation?
The formation of the hypoblast (endoderm) from the lower layer of the germinal disc
What is involution during gastrulation?
The migration of cells through the primitive streak to occupy a new position
What does gastrulation involve?
Transformation of blastula to gastrula by formation of three germinal layers
Where does gastrulation occur in vertebrates?
Inner cell mass of the ova in mammals or the blastoderm of the ova in birds
What do blasula-maps reveal about vertebrates?
They show a fundamentally similar pattern in all vertebrates
During embryonic development, which cells form the ectoderm?
Cells that migrate laterally between the already formed endoderm and the superficial layer of the epiblast
What is the function of the notochord during embryonic development?
Development of the primitive backbone (axial skeleton)
Which layer forms the fetal membranes in mammals and birds?
Extraembryonic ectoderm
From which cells does the notochord originate?
Proliferating cells of the primitive pit
What do the fetal membranes offer the embryo?
Protection, nourishment & way of excretion
What does organogenesis mean?
Formation of the organs
Which layer forms the yolk sac in birds?
Endoderm & mesoderm
What happens to the absorbed yolk sac at hatching in birds?
It becomes dry and is absorbed by the embryo
Which layer together with somatic mesoderm forms somatopleure?
Somatic mesoderm
What forms some cellular components of the born organism?
The notochord
Test your knowledge about the process of gastrulation, which involves the transformation of blastula to gastrula by the formation of three germinal layers (ectoderm, mesoderm & endoderm). This quiz covers the occurrence of gastrulation in the inner cell mass of mammals or the blastoderm of birds, and the development of germ layers from definite cell areas in the blastula.
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