Embryology Ch. 3
Terms
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- An adolescent female has had unprotected intercourse two weeks prior to evaluation and fears pregnancy. The most accurate method for evaluating pregnancy at this time is:
- To perform blood HCG levels
- Fusion of the female and male pronuclei
- 0-1 day postconception
- Morula
- 2-4 days postconception
- Blastocyst with bilaminar embryonic disc
- 6-7 days postconception
- Chorionic cavity
- Replaces the extra-embryonic ceolom
- Extraembryonic mesoderm
- 9-11 days postconception
- Lacunar network in the syncytiotrophoblast
- 12-14 days postconception
- Cleavage
- Serial cell divisions
- Cavitation
- 6-7 days postconception
- Secondary or definitive yolk sac
- 12-14 days postconception
- Primitive yolk sac
- Gives rise to the allantois
- Amniotic cavity
- Located dorsal to the bilaminar disc
- Prochordal plate
- The first indicator of cranial orientation
- Syncytiotrophoblast
- Precursor to placenta
- Chorion
- Somatic extraembryonic mesoderm, primitive chorionic villi, syncytiotrophoblast
- Embryonic disc
- Epiblast and hypoblast
- Blastocyst
- Trophoblast, inner cell mass, and blastocele only
- Embryonic nourishment, 8-10 days post-fertilization
- Embryotroph
- Embryonic nourishment, 13-14 days post-fertilization
- Syncytiotrophoblast, lacunar network, spiral arteries, endometrial veins
- An embryonic antigen not expressed in the mother unless she develops colorectal cancer is:
- Carcinoembryonic antigen
- The abortion pill RU 486 is an antagonist to:
- Progesterone
- The most common interference with implantation occurs with:
- Pelvic inflammatory disease
- Implantation of the blastocyst in areas other than the uterine wall is referred to as:
- Ectopic pregnancy
- If a delayed menstrual period (by two days) reflects pregnancy, what would be the stage of the pre-embryonic or embryonic development if the woman had ovulated at ther expected time of 14 days after her LMP?
- The blastocyst stage with circulation through the lacunar network of the syncytiotrophoblast
- An 18-year-old woman presents to the emergency room with right-sided abdominal pain. Her period is 1 week late, and she has been sexually active. After the history and physical examination, appropriate diagnostic evaluations of the woman's abdominal pain
- Measurement of a urine human chorionic gonadotropin levels together with abdominal or vaginal ultrasound, since elevation of urinary HCG levels may be delayed in tubal pregnancies.
- A predisposing factor to tubal pregnancy is:
- Pelvic inflammatory disease
- RU 486 (mefipristone) causes abortion by:
- Blocking the progesterone receptor
- The syncytiotrophoblast is derived from the
- Cytotrophoblast
- Fertilization
- Completion of meiosis II
- Compaction
- Formation of tight junctions
- Implantation
- Invasion by syncytiotrophoblast