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Questions and Answers
What is the main feature of the morula stage in embryological development?
What is the main feature of the morula stage in embryological development?
Which structure is responsible for forming the future placenta?
Which structure is responsible for forming the future placenta?
What characterizes the bilaminar embryonic disk formation?
What characterizes the bilaminar embryonic disk formation?
What is the role of the prochordal plate in embryonic development?
What is the role of the prochordal plate in embryonic development?
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Which cavity is formed by the epiblast during the second week of development?
Which cavity is formed by the epiblast during the second week of development?
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How does the zonula pellucida affect the zygote?
How does the zonula pellucida affect the zygote?
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Which of the following statements is true regarding the secondary yolk sac?
Which of the following statements is true regarding the secondary yolk sac?
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What is the key feature of the cecal plate during embryonic development?
What is the key feature of the cecal plate during embryonic development?
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Study Notes
Embryology
- Morula Formation: A solid ball of 16-32 blastomeres, formed by the third day. Enters the uterus.
- Blastocyst Formation: Outer layer (trophoblast) develops into placenta. Inner cell mass (embryoblast) forms the embryo, attaching to the endometrial epithelium on the sixth day (implantation).
- Bilaminar Embryonic Disc Formation: The embryoblast differentiates into two germ layers (ectoderm and endoderm). Two cavities are formed: amniotic cavity (epiblast forms floor) and secondary yolk sac (hypoblast forms roof).
- Prochordal Plate Development: A region of slight enlargement at the cephalic (head) end of the embryo. This area shows fusing ectodermal and endodermal cells. It establishes the body axis (head and tail ends). It represents the future buccopharyngeal membrane.
- Cecal Plate Development: Linear thickening of the epiblast, occurring at the caudal end (tail end).
- Implantation: The zygote is protected by the zona pellucida. This layer disintegrates during proliferation and implantation. The zygote attaches to the uterine wall due to special projections of blastomeres (cells).
Blastocyst Development
- The blastocyst differentiates into the amniotic cavity and secondary yolk sac
- The inner cell mass of the blastocyst differentiates into epiblast and hypoblast, which form the bilaminar embryonic disc
- The cells at the cephalic end of the embryo fuse to form the prochordal plate. This plate represents the future buccopharyngeal membrane.
- A thickening of the hypoblast cells (prochordal plate) is formed at the cephalic region.
- A linear thickening of epiblast cells (cecal plate) is formed at the caudal (tail) region.
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Description
Dive into the fascinating world of embryology with this quiz, covering crucial processes such as morula formation, blastocyst development, and the creation of the bilaminar embryonic disc. Test your knowledge on implantation and significant developmental features like the prochordal and cecal plates. Perfect for students and enthusiasts interested in human development.
