front 1 During implantation, which trophoblast layer remains mitotically
active and supplies new cells? | back 1 C. Cytotrophoblast |
front 2 Which trophoblast layer is multinucleated, erosive, and responsible
for invasion into endometrium? | back 2 A. Syncytiotrophoblast |
front 3 The embryoblast of the blastocyst is the: | back 3 D. Inner cell mass |
front 4 The bilaminar embryonic disc is composed of: | back 4 B. Epiblast + hypoblast |
front 5 “Embryotroph” is best defined as: | back 5 A. Maternal nourishing fluid |
front 6 Decidual cells near implantation are: | back 6 C. Polyhedral CT, glycogen-lipid stores |
front 7 hCG is a: | back 7 B. Glycoprotein hormone |
front 8 hCG reaches maternal blood for detection mainly through: | back 8 D. Syncytial lacunae to blood |
front 9 The corpus luteum is: | back 9 C. Endocrine estrogen-progesterone tissue |
front 10 By the end of week 2, common pregnancy tests detect which
syncytiotrophoblast product? | back 10 A. Human chorionic gonadotropin |
front 11 The epiblast is primarily composed of: | back 11 D. High columnar cells |
front 12 The hypoblast is primarily composed of: | back 12 B. Small cuboidal cells |
front 13 Primordial germ cells originate (per these notes) in the: | back 13 A. Primary umbilical vesicle |
front 14 “Umbilical vesicle” is used instead of “yolk sac” because: | back 14 C. Humans lack yolk |
front 15 The amniotic cavity forms when: | back 15 D. Amnioblasts split from epiblast |
front 16 Extraembryonic mesoderm is the tissue that: | back 16 B. Surrounds amnion and vesicle |
front 17 Oxygen is supplied and wastes removed by which vessels,
respectively? | back 17 A. Spiral arteries; endometrial veins |
front 18 What forms at the same time as the amniotic cavity? | back 18 D. Bilaminar embryonic disc |
front 19 A “10-day conceptus” is: | back 19 B. Completely embedded endometrium |
front 20 Early implantation nutrition reaches the embryonic disc mainly
via: | back 20 C. Embryotroph in syncytial lacunae |
front 21 The trophoblast is best defined as: | back 21 A. Outer blastocyst enzyme-secreting cells |
front 22 Compared with trophoblast expansion, bilaminar disc growth
is: | back 22 B. Slower than trophoblast |
front 23 The “closing plug” sealing endometrial epithelium is a: | back 23 A. Chorionic villus cap |
front 24 Lacunar networks later become the primordia of: | back 24 C. Intervillous space primordia |
front 25 Deficient implantation-site vascular development is associated with
low: | back 25 B. Connexin 43 |
front 26 The connecting stalk later becomes the: | back 26 A. Umbilical cord |
front 27 The secondary umbilical vesicle forms when: | back 27 C. Hypoblast endodermal migration |
front 28 Compared with the primary umbilical vesicle, the secondary vesicle
is: | back 28 D. Smaller than primary vesicle |
front 29 The end of the second week is marked by appearance of: | back 29 A. Primary chorionic villi appear |
front 30 The closing plug becomes covered around day 12 due to: | back 30 B. cAMP and progesterone |
front 31 The extraembryonic coelom splits into: | back 31 C. Somatic and splanchnic mesoderm |
front 32 Extraembryonic somatic mesoderm primarily: | back 32 D. Lines trophoblast, covers amnion |
front 33 Extraembryonic splanchnic mesoderm primarily: | back 33 A. Surrounds umbilical vesicle |
front 34 The chorion is the outermost membrane forming the fetal placenta
part; it is formed by: | back 34 B. Somatic mesoderm + trophoblast layers |
front 35 Before 20 weeks, expulsion of fetus with retained placenta
is: | back 35 C. Incomplete abortion |
front 36 Formation of the extraembryonic coelom occurs alongside formation of
the: | back 36 A. Secondary umbilical vesicle |
front 37 Placenta partially/completely covering the internal os (with bleeding
risk) is: | back 37 D. Placenta previa |
front 38 The prechordal plate forms as: | back 38 C. Day 14, hypoblast thickening |
front 39 The prechordal plate is clinically important because it marks
the: | back 39 B. Future mouth, head organizer |
front 40 Pelvic inflammatory disease (PID) is: | back 40 A. Pelvic organ infection/inflammation |
front 41 PID may include: | back 41 D. Salpingitis, oophoritis, endometritis, endocervicitis |
front 42 Abdominal pregnancy (per these notes) begins with implantation in
the: | back 42 B. Ampulla or fimbriae |
front 43 After expulsion into the peritoneal cavity, implantation often occurs
in the: | back 43 A. Rectouterine pouch |
front 44 Early pregnancy evaluation: endovaginal US measures which diameter to
assess development/outcome? | back 44 C. Chorionic sac diameter |
front 45 A medically performed termination before 20 weeks is: | back 45 D. Induced abortion |
front 46 A “stone fetus” (lithopedion) occurs when an: | back 46 B. Abdominal conceptus dies unnoticed |
front 47 Which embryonic tissue layers are formed from the hypoblast? | back 47 C. None; all from epiblast |
front 48 In these notes, the hypoblast still contributes by forming: | back 48 A. Extraembryonic mesoderm |
front 49 Implantation chronology: day 5 is characterized by: | back 49 D. Zona pellucida degenerates |
front 50 Implantation chronology: day 6 is characterized by: | back 50 C. Blastocyst adheres endometrium |
front 51 Implantation chronology: day 7 is characterized by: | back 51 B. Trophoblast splits two layers |
front 52 Implantation chronology: day 8 is characterized by: | back 52 A. Syncytium erodes, embeds blastocyst |
front 53 Implantation chronology: day 9 is characterized by: | back 53 C. Blood-filled lacunae appear |
front 54 Implantation chronology: day 10 is characterized by: | back 54 D. Closing plug forms |
front 55 Implantation chronology: day 11 is characterized by: | back 55 B. Lacunar networks form |
front 56 Implantation chronology: day 12 establishes uteroplacental
circulation when: | back 56 A. Maternal blood enters lacunae |
front 57 Implantation chronology: day 13 is characterized by: | back 57 D. Endometrial defect repaired |
front 58 Implantation chronology: day 14 is characterized by: | back 58 C. Primary chorionic villi develop |
front 59 Main cause of maternal death in first trimester (per these notes)
is: | back 59 B. Tubal ectopic pregnancy |
front 60 Missed period + abdominal pain + bleeding + peritoneal irritation
most suggests: | back 60 A. Tubal ectopic pregnancy |
front 61 Right-sided tubal ectopic pain may be confused with: | back 61 C. Appendicitis |
front 62 Compared with intrauterine pregnancy, ectopic β-hCG rises at
a: | back 62 D. Slower rate |
front 63 Slower β-hCG rise in ectopic pregnancy can cause: | back 63 A. False-negative test |
front 64 “Abortion” is best defined as: | back 64 B. Pre-viability conceptus expulsion |
front 65 Threatened abortion is: | back 65 D. Bleeding with miscarriage threat |
front 66 Spontaneous abortion is best defined (per these notes) as: | back 66 A. Loss before 20 weeks |
front 67 Habitual abortion is: | back 67 B. Three consecutive losses |
front 68 Complete abortion is: | back 68 C. All products expelled |
front 69 Missed abortion is: | back 69 D. Dead fetus retained |
front 70 The morning-after pill prevents pregnancy mainly by: | back 70 B. Preventing implantation |