Explore key concepts in embryology through practice questions focusing on the first three weeks of development. Topics include blastocyst implantation, ectopic pregnancies, mesoderm formation, uteroplacental circulation, and the role of the epiblast. Ideal for students preparing for medical exams.
A) cytotrophoblast
B) outer cell mass
C) endoderm
D) inner cell mass
E) ectoderm
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All of the following structures are necessary for blastocyst implantation EXCEPT?
Zona pellucida
Syncytiotrophoblast
Cytotrophoblast
Functional layer of endometrium
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A) Hypoblast cells
B) Extraembryonic ectoderm
C) Notochordal cells
D) Epiblast cells
E) Amnioblasts
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A) Prechordal plate
B) Cloacal membrane
C) Primitive streak
D) Neural tube
E) somites
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A) Hydatidiform mole
A) Premature rupture of the amniotic membrane
B) Placenta previa
C) Toxemia of pregnancy
D) Vasa previa
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A) Weeks 1-5 before fertilization
B) Weeks 1-5 after fertilization
C) Months 4-5 after fertilization
D) Months 5-6 after fertilization
E) Weeks 9 to 12 after fertilization
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A) Ovary
B) Mesentery of the intestine
C) Abdomen
D) ampullae region of uterine tube
E) isthmus region of uterine tube
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A) It is composed of small cuboidal cells
B) It forms the roof of the blastocyst cavity
C) It forms the primitive streak
D) Notochordal cells intercalate into it
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A) lateral plate mesoderm
B) ectoderm
C) neural crest cells
D) endoderm
E) intermediate mesoderm
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A) Lacunae form within the cytotrophoblast
B) Hydrolytic enzymes produced by the trophoblast degrade the endothelium of embryonic capillaries
C) It is established during the second week of development
D) It is a transient nutrient supply for the blastocyst during implantation
E) It only forms in ectopic implantations
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True
False
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A) extraembryonic mesoderm
B) embryoblast
C) exocoelomic membrane
D) connecting stalk
E) chorion
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A) hindbrain
B) Schwann cells
C) aorta
D) intestinal epithelia
E) nails
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A) Paraxial mesoderm contributes to formation of both areas
B) HOX genes contribute to both areas and could be involved
C) Body folding is important for both areas and may produce combined defects
D) The mother took fertility drugs
E) Neural crest cells contribute greatly to development of both regions
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A) Exocoelomic membrane and cytotrophoblast
B) Epiblast and hypoblast
C) Syncytiotrophoblast and endometrium
D) Exocoelomic membrane and syncytiotrophoblast
E) Syncytiotrophoblast and cytotrophoblast
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A) Epidermis
B) Enamel of teeth
C) Dermis of skin
D) Forebrain
E) Mammary gland
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A) Neural plate
B) Cloacal membrane
C) Posterior neuropore
D) Primitive streak
E) Notochord
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A) mesoderm
B) mesenchyme
C) ectoderm
D) neural crest cells
E) dermis
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A) endoderm
B) lateral plate mesoderm
C) ectoderm
D) splanchnic mesoderm
E) intermediate mesoderm
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A) somites
B) paraxial and intermediate mesoderm
C) yolk sac cavity
D) intraembryonic cavity
E) amniotic cavity
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