15 Questions
What is the function of the parietal layer in the formation of skin and limbs?
The parietal layer forms the dermis of skin in the body wall and limbs, and also forms the bones and connective tissues of the limbs, as well as the sternum.
What is the role of mesodermal cells in the formation of body cavities?
Mesodermal cells surround the intraembryonic cavity and form the mesothelial membrane or serous membrane, which lines the pleural, parietal, and pericardial cavities and secretes serous fluid.
What is the role of the notochord and prechordal mesoderm in neural plate formation?
The notochord and prechordal mesoderm induce the ectoderm to form the neural plate, which eventually gives rise to the neural tube.
What is the significance of coelom formation during embryonic development?
Coelom is a mesodermally lined cavity between the gut and the outer body wall, and its formation begins during the gastrulation stage.
What is the fate of the visceral layer during embryonic development?
The visceral layer, along with the endoderm, forms the wall of the gut tube, and the mesodermal cells here form a thin serous membrane around each organ.
How can polyspermy result in the death of an embryo?
Polyspermy can result in the death of an embryo because multiple sperm fuse with the egg, making the embryo genetically non-viable.
What is the significance of cleavage in embryonic development?
Cleavage is significant in embryonic development because it increases the number of cells without an increase in mass, forming the blastula.
What is the composition of the bilaminar germ disc?
The bilaminar germ disc is composed of the epiblast and hypoblast, which together surround the primitive yolk sac.
What is the significance of the blastocyst stage in embryonic development?
The blastocyst stage is significant because it contains the inner cell mass, which will form the embryo proper, and the outer cell mass, which will form the trophoblast.
What is the significance of the decidual reaction in embryonic development?
The decidual reaction is significant because it allows the blastocyst to implant in the endometrium, ensuring a successful pregnancy.
What is the composition of the blastula?
The blastula is composed of an outer layer of cells, called blastomeres, which will form the embryoblast and trophoblast.
What is the significance of the morula stage in embryonic development?
The morula stage is significant because it marks the formation of the 16-cell stage, which will eventually form the blastocyst.
What is the significance of the uterine tube in embryonic development?
The uterine tube is significant because it provides a site for fertilization and early embryonic development, ensuring the successful implantation of the embryo.
What is the significance of the inner cell mass in embryonic development?
The inner cell mass is significant because it will form the embryo proper, giving rise to the future organism.
What is the significance of the outer cell mass in embryonic development?
The outer cell mass is significant because it will form the trophoblast, which will give rise to the placenta and other supporting structures.
This quiz covers the development of paraxial mesoderm during the third week of embryonic development. Learn how it differentiates into segments, somitomeres, and somites in the cranial region and beyond. Test your knowledge of the formation of occipital, cervical, thoracic, lumbar, sacral, and coccygeal regions.
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