Podcast
Questions and Answers
What structure differentiates first in the inner cell mass during embryonic development?
What structure differentiates first in the inner cell mass during embryonic development?
Which of the following accurately describes the function of chorionic villi?
Which of the following accurately describes the function of chorionic villi?
Which extraembryonic structure develops into the amniotic cavity?
Which extraembryonic structure develops into the amniotic cavity?
What is the primary role of the endometrial glands during early embryonic development?
What is the primary role of the endometrial glands during early embryonic development?
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At what stage does the primary yolk sac begin to develop?
At what stage does the primary yolk sac begin to develop?
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What structure forms from the hypoblast during the early stages of embryonic development?
What structure forms from the hypoblast during the early stages of embryonic development?
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Which component is primarily responsible for eroding the endometrium during implantation?
Which component is primarily responsible for eroding the endometrium during implantation?
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What is the primary function of HCG secreted by the syncytiotrophoblast?
What is the primary function of HCG secreted by the syncytiotrophoblast?
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The development of which structure indicates the formation of the bilaminar embryonic disc?
The development of which structure indicates the formation of the bilaminar embryonic disc?
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Which structure develops from extraembryonic mesoderm during early embryonic growth?
Which structure develops from extraembryonic mesoderm during early embryonic growth?
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What is the significance of the lacunar spaces found within syncytiotrophoblasts during implantation?
What is the significance of the lacunar spaces found within syncytiotrophoblasts during implantation?
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What is the sequence of development starting from the morula to the formation of the blastocyst?
What is the sequence of development starting from the morula to the formation of the blastocyst?
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Which embryonic layer is responsible for forming structures like the heart and muscles in the developing embryo?
Which embryonic layer is responsible for forming structures like the heart and muscles in the developing embryo?
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What is formed during the second week of embryonic development?
What is formed during the second week of embryonic development?
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Which structure is responsible for the formation of the chorionic cavity?
Which structure is responsible for the formation of the chorionic cavity?
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Which layer forms the interface between maternal blood and embryonic tissues?
Which layer forms the interface between maternal blood and embryonic tissues?
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What splits to form somatic and splanchnic layers of mesoderm?
What splits to form somatic and splanchnic layers of mesoderm?
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What primarily forms the yolk sac endoderm?
What primarily forms the yolk sac endoderm?
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Which of the following statements about the development of the amniotic cavity is correct?
Which of the following statements about the development of the amniotic cavity is correct?
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What happens to the primary yolk sac by the end of the third week?
What happens to the primary yolk sac by the end of the third week?
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The bilaminar embryonic disc consists of which two primary layers?
The bilaminar embryonic disc consists of which two primary layers?
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What is the primary function of the chorion during early development?
What is the primary function of the chorion during early development?
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What structure fills the space between the cytotrophoblast and the primary yolk sac?
What structure fills the space between the cytotrophoblast and the primary yolk sac?
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Study Notes
Blastocyst & Bilaminar Disc
- The blastocyst forms from the morula
- The inner cell mass differentiates into hypoblasts (primary endoderm) and epiblasts (ectoderm)
- Appearance of body stalk and prochordal plate
- The hypoblasts differentiate by day 7
- The epiblasts appear next and form the amniotic cavity by enlarging
- The bilaminar embryonic disc is formed by the hypoblast and epiblast
- The primary yolk sac is formed by the hypoblast
- Extraembryonic mesoderm fills the space between cytotrophoblast and amnion
- Extraembryonic mesoderm is derived from the yolk sac endoderm
- The extraembryonic coelom (chorionic cavity) is formed by the fusion of clefts in the extraembryonic mesoderm
- The chorionic cavity splits the extraembryonic mesoderm into somatic and splanchnic layers
- The primary yolk sac shrinks to form the secondary (definitive) yolk sac
- The chorionic sac is formed during the second week
Chorionic Villi & Embryotroph
- The syncytiotrophoblast shows villous projections and lacunar spaces
- The syncytiotrophoblast secretes proteolytic enzymes to erode the endometrium and human chorionic gonadotropin (HCG) to sustain the corpus luteum
Endometrial Gland
- The syncytiotrophoblast erodes the endometrium to allow the blastocyst to burrow into the compact layer of endometrium
- This process begins on the 5th day and finishes on the 10th day
- This is part of the implantation process
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Description
Test your knowledge on the formation of the blastocyst and the development of the bilaminar embryonic disc. This quiz covers key concepts such as the differentiation of hypoblasts and epiblasts, the appearance of the amniotic cavity, and the formation of extraembryonic structures. Perfect for students studying embryology!
