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General Embryology Questions with Correct Answers
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General Embryology Questions with Correct Answers
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General Embryology Questions with Correct AnswersWhat is Embryogenisis? Correct Answer-The first 8 weeks of
development after fertilisation.
What is embryology? Correct Answer-The study of prenatal
development.
What is the definition of a zygote? Correct Answer-It is a single cell
formed when an egg and a sperm cell fuse through fertilisation.
How long are zygotes kept in cleavage for? Correct Answer-The first 12
- 24 hours of fertilisation.
What is the 32 cell stage of a zygote called? Correct Answer-A Morula
What is blastulation? Correct Answer-Formation of blastocyst
What are the 2 divisional layers found within the 6th day of
differentiating Morula cell? Correct Answer-Trophoblast
Embryoblast
What is the name of the receptor that promotes attachment of the
blastocyst to the endometrium? Correct Answer-Integrin
,What structure does the trophoblast give rise to? Correct Answer-The
placenta
What does the embryoblast give rise to? Correct Answer-The embryo
proper (the whole body).
The embryoblast cells are Pluripotent - TRUE or FALSE? Correct
Answer-TRUE
The cells in the embryoblast eventually give rise to all cells of the body.
In the 2nd week of Embryogensis, the embryoblast layer differentiates
into the following?...
A - Syncytiotrophoblast cells
B - Cytotrophoblast cells
C - Hypoblast cells
D - Epiblast cells Correct Answer-C and D
In the 2nd week of Embryogensis, the trophoblast layer differentiates
into the following?...
A - Syncytiotrophoblast cells
B - Cytotrophoblast cells
C - Hypoblast cells
,D - Epiblast cells Correct Answer-A and B
What are lacunae? Correct Answer-(lakunae = little lakes). Spaces in the
extracellular matrix.
On what day does the "Lacunae stage" occur?
A. Day 3
B. Day 9
C. Day 11 - 12
D. Day 8 Correct Answer-B. Day 9
What is the name of the membrane, formed from the hypoblast layer, on
day 9 of embryogenesis? Correct Answer-Primary Yolk
sac/exocoelomeic cavity.
What is the bilaminar disc?
A - Epiblast and Trophoblast
B - Syncytiotrophoblast and Hyboblast
C - Epiblast and Hypoblast
D - Cytotrophoblast and Epiblast Correct Answer-C - Epiblast and
Hypoblast
, After the blastocyst implants, the embryoblast differentiates into 2
layers.
On day 11 -12 of embryogenesis?
A. The blastocyst is partially embedded
B. The blastocyst is fully embedded Correct Answer-B. The blastocyst is
fully embedded
What are sinusoids? Correct Answer-Leaky capillaries found in the
endometrium of a mothers womb.
What happens when the syncytial lacunae and the sinusoids (from the
endometrium lining) fuse? Correct Answer-The maternal blood enters
the lacunar system, forming the uteroplacental circulation.
How is the extraembryonic mesoderm formed? Correct Answer-A new
population of cells form between the inner surface of the cytotrophoblast
and the outer cells of the yolk sac.
What happens when spaces fill the extraembryonic mesoderm? Correct
Answer-These spaces become confluent to form one WHOLE cavity =
Chorionic cavity
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