Chapter 55 Key terms Flashcards Preview

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Flashcards in Chapter 55 Key terms Deck (24)
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1
Q

the transformation once fertilization occurs through to the fetal stage

A

Embryogenesis

2
Q

cellular outermost extraembryonic membrane composed of trophoblast lined with mesoderm; it devfelopes villi about 2 weeks after fertilization, is vascularized by allantoic vessels a week later, gives rise to the placenta, and persists until birth

A

Chorion

3
Q

smooth membrane enclosing the fetus and amniotic fluid; it is loosely fused with the outer chorionic membrane except at the placental insertion of the umbilical cord, where the amnion is contiguous with the membranes surrounding the umbilical cord

A

Amnion

4
Q

circular structure within the gestational sac seen on ultrasound between 4-10 weeks of gestational age; supplies nutrition, facilitates waste removal and is the origin of early hematopoietic stem cells in the embryo; it lies between the chorion and the amnion

A

yolk sac

5
Q

the early beginnings of the umbilical cord that extend from the yolk sac through the yolk stalk

A

allantois

6
Q

the fetal surface of the placenta

A

Chorionic plate

7
Q

the decidual reaction that occurs between the blastocyte and the myometrium

A

Decidual basalis

8
Q

microscopic vascular projections from the chorion that combine with the maternal uterine tissue to form the placenta

A

intervilllus spaces, chorionic villus

9
Q

layer of the placenta that is filled with several mainstem villi and their branches

A

cotyledons

10
Q

oxygen exchange, metabolism, and endochrine function

A

functions and activities of the placenta

11
Q

maternal blood flows in through the endbranches of the uterine artery and spiral arteries, flows around the surface of the villi, Oxy rich blood flows to the fetus vis the Umb V and returns through the Umb A’s.

A

fetal-placental-uterine circulation

12
Q

Normal less than 600g and less than 4cm thick.

A

placental sizes

13
Q

normal connection is near center of placenta. Battledore is at the margin within 10mm of the edge and velamentous inserts on the membranes

A

cordal attachments

14
Q

ideal is fundal location, very important to note if it is near or over the CX

A

placental positions

15
Q

graded 1-4 based on sonographic appearance

A

maturity and grading

16
Q

placentomegaly, placenta previa, vasa previa,

A

abnormalities of the placenta

17
Q

on the margin or covering the CX

A

abnormal placental attachments

18
Q

presence of one or more accessory lobes connected to the body of the placenta by placenta vessels

A

Succenturiate Placenta

19
Q

condition where the chorionic plate is smaller than the basal plate, the margin is raised with a rolled edge

A

Circumvallate Placenta

20
Q

the chorionic placve of the placenta is smaller than the basal plate, with a flas interface between the fetal membrane and the placenta

A

Circummarginate Placenta

21
Q

bleeding from the placenta from any cause

A

Placental Hemorrhage

22
Q

separation of a normally implanted placenta prior to term delivery

A

Placental Abruption

23
Q

focal discrete lesion caused by ischemic nechrosis, found in 25% of pregnancies

A

Placental infarcts

24
Q

molar pregnancies, benign or malignant, include partial, complete and coexisitng

A

Placental Tumors