Bilaminar Embryo: Embryology Quiz
(210).jpg "Bilaminar Embryo: Embryology Quiz")
What do you know about the Bilaminar Embryo? The two-layered embryo describes the inner cell mass separating to form an initial two-layered structure. In human development, this occurs during the second week. The epiblast layer will then develop most of the embryo. Recreating the human embryo at implantation is essential for a successful pregnancy. This fascinating quiz will explain to you about the bilaminar embryo.
- 1.The blastocyst is weakly attached to the uterine wall during apposition via what structure(s)?
- A.
Pinopodes
- B.
Microvilli
- C.
Sterocilia
- D.
Pseudopodes
- 2.The strong attachment of the blastocyst to the uterine wall during adhesion is made via:
- A.
Integrin proteins
- B.
Extracellular matrix proteins
- C.
Microvilli
- D.
Proteases
- 3.Which of the following best describes a syncytium?
- A.
A multinucleated mass of cytoplasm resulting from the fusion of mononucleated cells
- B.
The formation of a hard mass of trophoblasts due to only paternal DNA present in zygote after fertilization
- C.
Layer of mitotically active cells that line the embryoblast and blastocystic cavity
- D.
A protein that facilitates the migration of the blastocyst through the uterine epithelium
- 4.What is the function of epiblast cells?
- A.
Gives rise to embryo
- B.
Forms amniotic membrane
- C.
Secretes hCG and progesterone to maintain placenta
- D.
To penetrate through the Fallopian tubes in order to implant into the uterus
- 5.At about what point does the primary yolk sac begin to develop?
- A.
Day 8
- B.
Day 2
- C.
Day 15
- D.
Day 14
- 6.Which of the following best describes what occurs during the epithelial to mesenchymal transformation?
- A.
Cells become long, spindle shaped cells with invasive motility
- B.
Cells become columnar to prepare for secretion of hormones
- C.
Cells become cuboidal in order to create a protective lining for the developing embryo
- D.
Cells become endothelial cells to line the newly forming placental blood vessels
- 7.What marker(s) differentiate mesenchymal cells from epithelial cells? (which are present on mesenchymal cells)
- A.
Vimentin
- B.
N-cadherin
- C.
E-cadherin
- D.
Desmoplakin
- 8.At about what point is the extraembryonic mesoderm formed?
- A.
Day 11
- B.
Day 35
- C.
Day 4
- D.
Day 7
- 9.The hypoblast cells can differentiate in which cell type(s)?
- A.
Exocoelomic membrane
- B.
Mesenchymal cells
- C.
Extraembryonic endoderm
- D.
Extraembryonic membrane
- E.
Somatopleuric cells
- F.
Syncytiotrophoblast cells
- 10.The secondary yolk sac is lined by:
- A.
Extraembryonic endoderm
- B.
Splanchnopleuric mesoderm
- C.
Exocoelomic cysts
- D.
Hypoblast cells
- 11.The chorionic plate consists of what structures?
- A.
Extraembryonic somatopleuric mesoderm
- B.
Cytotrophoblast
- C.
Syncytiotrophoblast
- D.
Connecting stalk
- E.
Extraembryonic splanchnopleuric mesoderm
- 12.Where does the development of blood cells first begin in utero?
- A.
Extraembryonic splanchnopleuric mesoderm
- B.
Liver
- C.
Bone marrow
- D.
Proximal ends of long bones
- 13.Blood cell formation at week 6 begins where?
- A.
Liver
- B.
Extraembryonic splanchnopleuric mesoderm
- C.
Bone marrow
- D.
Distal ends of long bones
- 14.The primary stem villi begin to form by:
- A.
Day 11
- B.
Day 3
- C.
Day 24
- D.
Day 5
- 15.The placenta goes through a couple of stages to mature. At around which week is primitive placenta established?
- A.
Week 3
- B.
Week 1
- C.
Week 2
- D.
Week 4
- 16.The arteriocapillary networks that are formed in the primitive placenta become connected to the embryonic heart through:
- A.
Vessels in the extraembryonic mesoderm of chorion and connecting stalk
- B.
Cytotrophoblasts creating long vessels
- C.
Syncytiotrophoblasts lining long vessels
- D.
Primary stem villi
- 17.What is a likely cause of ectopic pregnancy?
- A.
Uterine damage caused by inflammation due to PID
- B.
Ectopic pregnancies are spontaneous, random events
- C.
Implantation of zygote in uterus
- D.
Previous Cesarean sections
- 18.Most ectopic pregnancies occur where?
- A.
Fallopian tubes
- B.
Abdomen
- C.
Placenta
- D.
Cervix
- 19.What is the cause of placenta previa?
- A.
Implantation of zygote occurs in the internal os of cervix
- B.
Implantation of zygote in Fallopian tubes
- C.
Complete blockage of vaginal opening due to disorganized mass of placental derivatives
- D.
Severe abdominal pain
- 20.Complete hydatidiform moles are mostly composed of:
- A.
Trophoblast cells
- B.
Syncytiotrophoblast cells
- C.
Blastocyst cells
- D.
Hypoblast cells
- 21.The majority of complete hydatidiform mole cases are associated with:
- A.
2 sets of paternal chromosomes
- B.
2 sets of maternal chromosomes
- 22.What is the common cause of a partial hydatidiform mole?
- A.
Dispermy
- B.
Dipliody
- C.
2 sets of chromosomes of maternal origin
- D.
Methotrexate
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