Chapter 10

Question 1

length of pregnancy

Answer 1

280 days; 40 weeks after LNMP; 38 weeks after fertilization

Question 2

end of the embryonic period

Answer 2

8 weeks

Question 3

bushy chorion assoc. w/ decidua basalis, at the embryonic region

Answer 3

Chorion frondosum

Question 4

smooth chorion assoc. w/ decidua capsularis,
at the abembryonic region

Answer 4

Chorion laevae

Question 5

core of maternal tissue covered by surface layer of syncytial cells formed during 4-5th month

Answer 5

decidual septa

Question 6

number of compartments of maternal tissue that does not reach the chorionic plate; formed by the decidual septa

Answer 6

cotyledons

Question 7

numerous number of large arteries
and veins in the placenta are called

Answer 7

chorionic vessels

Question 8

maintain pregnancy

Answer 8

progesterone

Question 9

uterine and mammary gland development

Answer 9

estriol

Question 10

maintains the corpus luteum

Answer 10

human chorionic gonadotropin

Question 11

gives fetus priority on maternal blood glucose; milk production

Answer 11

somatomammotropin

Question 12

oval line of reflection between the amnion &
embryonic ectoderm

Answer 12

primitive umbilical ring

Question 13

containing the allantois and the umbilical vessels (2 arteries and 1 vein)

Answer 13

connecting stalk

Question 14

vitelline duct accompanied by vitelline vessels

Answer 14

yolk stalk

Question 15

connecting the intraembryonic & extraembryonic cavities

Answer 15

canal

Question 16

(10th week): with yolk sac, yolk stalk and
intestinal loop

Answer 16

primitive umbilical cord

Question 17

excess of amniotic fluid (1500-2000 ml)

Answer 17

hydramnios or polyhydramnios

Question 18

decreased in amount (less than 400ml)

Answer 18

oligohydramnios

Question 19

most common cause of preterm labor

Answer 19

Premature rupture of amnion

Question 20

Also known as fraternal twins

Answer 20

dizygotic twins

Question 21

also known as identical twins

Answer 21

monozygotic twins

Question 22

One twin is larger and the other is compressed or mummified

Answer 22

fetus papyraceus

Question 23

placental vascular anastomoses produced
unbalanced blood flow in the 2 fetuses

Answer 23

twin transfusion syndrome

Question 24

Caused by partial splitting of primitive node or streak or misexpression of genes like Goosecoid

Answer 24

siamese twins (conjoined twins)

Question 25

types of conjoined twins

Answer 25

thoracopagus, pygopagus, craniopagus

Question 26

(thinning and shortening) and dilatation of the cervix; this stage ends when the cervix is fully dilated
* produced by uterine contractions that force the amniotic sac against the cervical canal like a wedge or, if the membranes have ruptured, then pressure will be exerted by the presenting part of the fetus, usually the head

Answer 26

effacement

Question 27

also assisted by uterine contractions, but the most important force is provided by increased intraabdominal pressure from contraction of abdominal muscles

Answer 27

delivery of fetus

Question 28

requires uterine contractions and is aided by increasing intra-abdominal pressure.

Answer 28

delivery of placenta and fetal membranes