Early Embryology Blue Boxes Flashcards Preview

IUSM Anatomy > Early Embryology Blue Boxes > Flashcards

Flashcards in Early Embryology Blue Boxes Deck (26)
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1

When nondisjuction occurs during an early cleavage division of a zygote and an embryo with two or more cell ines with different chromosome complements is produced

 

mosaicism

2

Preimplantation genetic diagnosis can be carried out how many days after in vitro fertilization of an oocyte?

 

3 to 5 days

3

Early implantation of the _____ is a critical period of development that may fail to occur

 

blastocyst

4

Overall early spontaneous abortion rate

45%

5

More than half of all known spontaneous abortions occur because of abnormalities in what?

 

chromosomes

6

When blastocysts implant outside the uterus

ectopic pregnancy

7

95% to 98% of ectopic implantations occur where?

uterine tubes (more often in ampulla and isthmus)

8

pocket formed by the deflection of the peritoneum from the rectum to the uterus where blastocysts can commonly implant

rectouterine pouch

9

a calcified fetus

 

lithopedion

10

the placenta becomes firmly attached to fibrous and muscular tissues of the cervix

 

cervical implantation

11

implantation of a blastocyst in the inferior segment of the uterus near the interal os (opening) of the cervix results in what?

 

placenta pervia (placenta that particually or completely covers os)

12

early pregnancy loss

 

miscarriage

13

most spontaneous abortions ob embryos occur during the first ___ weeks

3

14

The higher incidence of early spontaneous abortions in older women probably results from the increasing frequence of?

nondisjunction during oogenesis

15

Relatively large doses of progestins and/or estrogens ("morning after pill") usually does not prevent fertilization but often prevents what?

 

implantation of the blastocyst

16

A high dose of diethylstilbestrol does what?

accelerates the passage of the cleaving zygote along the uterine tube

17

An intrauterine device usually interferes with implantation by causing what?

a local inflammatory reaction

18

Symptom of pregnancy?

nausea/vomiting

19

remnants of the primitive streak may persist and give rise to a _________

sacrococcygeal teratoma

20

type of germ cell tumor

teratoma

21

benign and malignant tumors that form from vestigial remnants of notochordal tissue

chordomas

22

remnants of the extraembryonic portion of hte allantois

allantoic cysts

23

partial absence of the brain (neural tube defect)

meroencephaly

24

cystic swellings formed from degenerating chorionic villi

hydatidiform moles

25

malignant trophoblastic lesions

choriocarcinomas

26