Chapter 3

Question 1

Gonorrhea and treated for pelvic imflamm. She had her right uterine tube removed

Answer 1

She had an ectopic pregnancy in her right uterine tube. With the rapidly increasing size of the embryo and its extraembryonic structures, her right uterine tube had ruptured

Question 2

What is the most common condition associated with spontaneously aborted embryos?
A. Maternal imprinting 
B. Paternal imprinting 
C. Ectopic pregnancy 
D. Chromosomal abnormalities 
E. Lack of X-chromosomal inactivation

Answer 2

D. Chromosomal abnormalities

Question 3

What tissue from the implanting embryo directly interfaces with the endometrial connective tissue?
A. Corona radiata 
B. Inner cell mass 
C. Extraembryonic mesoderm
D. Epiblast 
E. Syncytiotrophoblast

Answer 3

E. Syncytiotrophoblast

Question 4

Identical twinning is made possible by what process or property of the early embryo?
A. Regulation
B. Aneuploidy
C. Paternal imprinting
D. Maternal imprinting
E. X-chromosomal inactivation

Answer 4

A. Regulation

Question 5

The zona pellucida:
A. Aids in penetration of the endometrial epithelium
B. Serves as a source of nutrients for the embryo
C. Prevents premature implantation of the cleaving embryo
D. All of the above
E. None of the above

Answer 5

C. Prevents premature implantation of the cleaving embryo

Question 6

What is the importance of the inner cell mass of the cleaving embryo?

Answer 6

The embryonic body proper arises from the inner cell

mass.

Question 7

Parental imprinting is a phenomenon showing that certain homologous maternal and paternal chromosomes have different influences on the development of the embryo. Excess paternal influences result in the abnormal development of what type of tissue at the expense of development of the embryo itself?

Answer 7

Trophoblastic tissues.

Question 8

What is the function of integrins in implantation?

Answer 8

They allow the trophoblast of the embryo to adhere to the

uterine epithelium.

Question 9

What is the cellular origin of the synctiotrophoblast of the implanting embryo?

Answer 9

Cells derived from the cytotrophoblast fuse to form the

syncytiotrophoblast.

Question 10

A women who is 2-3 months preggo suddenly develops severe lower abd pain. In the differential dx, the physician must include the possibility of what condition?

Answer 10

In addition to the standard causes of lower abdominal
pain, such as appendicitis, the physician should consider
ectopic pregnancy (tubal variety) as a result of stretching
and possible rupture of the uterine tube containing the
implanted embryo.