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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?
- It is characterized by the formation of two cavities.
- It is a solid ball of 16-32 blastomeres. (correct)
- It attaches to the endometrial epithelium.
- It is formed by the differentiation of the ectoderm.
Which structure is responsible for forming the future placenta?
Which structure is responsible for forming the future placenta?
- Hypoblast
- Trophoblast (correct)
- Inner cell mass
- Epiblast
What characterizes the bilaminar embryonic disk formation?
What characterizes the bilaminar embryonic disk formation?
- The differentiation of the trophoblast into ectoderm.
- The formation of the amniotic cavity and secondary yolk sac. (correct)
- The attachment to the endometrial epithelium.
- The presence of only ectodermal cells.
What is the role of the prochordal plate in embryonic development?
What is the role of the prochordal plate in embryonic development?
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?
How does the zonula pellucida affect the zygote?
How does the zonula pellucida affect the zygote?
Which of the following statements is true regarding the secondary yolk sac?
Which of the following statements is true regarding the secondary yolk sac?
What is the key feature of the cecal plate during embryonic development?
What is the key feature of the cecal plate during embryonic development?
Flashcards
Morula
Morula
A solid ball of 16-32 cells formed by the 3rd day of embryonic development. It enters the uterus.
Blastocyst
Blastocyst
A hollow ball of cells consisting of an outer layer (trophoblast) and an inner cell mass (embryoblast). It attaches to the uterine lining on the 6th day.
Trophoblast
Trophoblast
The outer layer of the blastocyst that develops into the placenta, the organ that connects the developing embryo to the mother.
Embryoblast
Embryoblast
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Bilaminar Embryonic Disc
Bilaminar Embryonic Disc
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Amniotic Cavity
Amniotic Cavity
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Prochordal Plate
Prochordal Plate
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Cecal Plate
Cecal Plate
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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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