Embryology Ch. 3

Front 1

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:

Back 1

To perform blood HCG levels

Front 2

Fusion of the female and male pronuclei

Back 2

0-1 day postconception

Front 3

Morula

Back 3

2-4 days postconception

Front 4

Blastocyst with bilaminar embryonic disc

Back 4

6-7 days postconception

Front 5

Chorionic cavity

Back 5

12-14 days postconception

Front 6

Extraembryonic mesoderm

Back 6

9-11 days postconception

Front 7

Lacunar network in the syncytiotrophoblast

Back 7

12-14 days postconception

Front 8

Cleavage

Back 8

2-4 days postconception

Front 9

Cavitation

Back 9

6-7 days postconception

Front 10

Secondary or definitive yolk sac

Back 10

12-14 days postconception

Front 11

Primitive yolk sac

Back 11

Gives rise to the allantois

Front 12

Amniotic cavity

Back 12

Located dorsal to the bilaminar disc

Front 13

Prochordal plate

Back 13

The first indicator of cranial orientation

Front 14

Syncytiotrophoblast

Back 14

Precursor to placenta

Front 15

Chorionic cavity

Back 15

Replaces the extra-embryonic ceolom

Front 16

Chorion

Back 16

Somatic extraembryonic mesoderm, primitive chorionic villi, syncytiotrophoblast

Front 17

Embryonic disc

Back 17

Epiblast and hypoblast

Front 18

Blastocyst

Back 18

Trophoblast, inner cell mass, and blastocele only

Front 19

Embryonic nourishment, 8-10 days post-fertilization

Back 19

Embryotroph

Front 20

Embryonic nourishment, 13-14 days post-fertilization

Back 20

Syncytiotrophoblast, lacunar network, spiral arteries, endometrial veins

Front 21

An embryonic antigen not expressed in the mother unless she develops colorectal cancer is:

Back 21

Carcinoembryonic antigen

Front 22

The abortion pill RU 486 is an antagonist to:

Back 22

Progesterone

Front 23

The most common interference with implantation occurs with:

Back 23

Pelvic inflammatory disease

Front 24

Implantation of the blastocyst in areas other than the uterine wall is referred to as:

Back 24

Ectopic pregnancy

Front 25

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?

Back 25

The blastocyst stage with circulation through the lacunar network of the syncytiotrophoblast

Front 26

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 should include:

Back 26

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.

Front 27

A predisposing factor to tubal pregnancy is:

Back 27

Pelvic inflammatory disease

Front 28

RU 486 (mefipristone) causes abortion by:

Back 28

Blocking the progesterone receptor

Front 29

The syncytiotrophoblast is derived from the

Back 29

Cytotrophoblast

Front 30

Fertilization

Back 30

Completion of meiosis II

Front 31

Compaction

Back 31

Formation of tight junctions

Front 32

Cleavage

Back 32

Serial cell divisions

Front 33

Implantation

Back 33

Invasion by syncytiotrophoblast