Lecture 2 Flashcards
What is the name of the stage where 12-16 blastomeres form, penetrating the uterus at 72 hours?
• A. Morula
• B. Blastocyst
• C. Zygote
• D. Blastocoel
Morula
What marks the end of the second week in trilaminar blastocyst formation?
• A. Extraembryonic somatopleure
• B. Connecting stalk
• C. Primitive groove
• D. Exocoelomic membrane
Extraembryonic
During implantation, what happens on days 7-8?
• A. Blastocyst fully implants
• B. Isolated lacunae form
• C. Syncytiotrophoblast erodes endometrial epithelium
• D. Zona pellucida disappears
Synctiotrophoblast erodes endometrial
Which layer is formed during gastrulation?
• A. Trophoblast
• B. Mesoderm
• C. Syncytiotrophoblast
• D. Embryoblast
Mesoderm
What does the notochord induce in the overlying ectoderm?
• A. Blastocyst rotation
• B. Neural plaque formation
• C. Syncytiotrophoblast differentiation
• D. Lacunar network formation
Neural plaque formation
What structure forms on the outer face of the embryonic disc on day 7 in bilaminar blastocyst formation?
• A. Amniotic cavity
• B. Primitive groove
• C. Yolk sac
• D. Blastocyst cavity
Amniotic cavity
On day 6 of the unilaminar blastocyst, what adheres to the uterine lining?
• A. Embryoblast
• B. Trophoblast
• C. Blastocoel
• D. Morula
Trophoblast
Which structure rotates and implants into the endometrium of the uterus during fertilization?
• A. Blastocyst
• B. Morula
• C. Zygote
• D. Trophoblast
Blastocyte
What is the result of trophoblast cells secreting human chorionic gonadotropin (hCG)?
• A. Formation of blastocoel
• B. Decidual reaction
• C. Bilaminar blastocyst
• D. Extraembryonic somatopleure
Decidual reaction
What is the most common risk factor for tubal extrauterine pregnancy?
• A. Blastocyst rotation
• B. Pelvic inflammatory disease
• C. Syncytiotrophoblast differentiation
• D. Primitive groove formation
Pelvic inflammatory
