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Bilaminar Embryo - Coggle Diagram
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- Evaluate the process of cleavage. What is the result of cleavage?
- Describe the arrangement and timing of the morula. What are the two components of
the morula and what does each give rise to?
- Describe how a morula becomes a blastocyst
- What are the two components of the blastocyst and what does each give rise to?
- Describe the importance of the blastocyst “hatching”
- Evaluate what the trophoblast differentiates into. Which invades into the uterine endometrium? Which component produces hCG? Why is this important at this time in the pregnancy
- Assess which structure attaches to the endometrium of the uterus. When does this
occur?
- What is an ectopic pregnancy? Where do these most commonly occur?
Partial Answer:
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- Describe what happens if the implantation occurs close to the internal os (opening) of
the cervix?
- Analyze the formation of hydatidiform moles / molar pregnancy. Why are there high
levels of hCG?
- Assess why non-viable blastocysts do not show signs of pregnancy
cytoptrophoblast
- Describe the formation of the chorion / chorionic plate and chorionic cavity
- Assess the formation of primary villi. What structure do they develop from? What do
they grow toward? What happens to form a secondary villus? A tertiary villus?
- Evaluate what the embryoblast differentiates into
- Evaluate what occurs within the epiblast and hypoblast and what they differentiate into
Hypoblast
- Evaluate the formation of the primitive (primary) yolk sac compared to the definitive
(secondary) yolk sac
Epiblast
- Describe the formation of the amnion and amniotic cavity
- Assess the formation of the uteroplacental circulation. What are lacunae, where do
they develop, and what do they contain?
- Describe the formation of the connecting stalk and 20. Describe the importance of extra-embryonic mesoderm
Partial Answers
The connecting stalk eventually forms the future umbilical cord
The Extraembryonic mesoderm is a specialized type of mesoderm that develops outside of the embryo itself during embryogenesis. It plays crucial roles in supporting the developing embryo and facilitating its interaction with the maternal tissues. Extraembryonic mesoderm arises during gastrulation, the process by which the three primary germ layers—ectoderm, mesoderm, and endoderm—are established.
Here are some key points about extraembryonic mesoderm:
Formation: Extraembryonic mesoderm originates from mesodermal cells that migrate away from the primitive streak during gastrulation. These cells move towards the outer layer of the embryo, where they contribute to the formation of extraembryonic tissues.