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Flashcards in PPt. 1-3 Deck (226)
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1

Generally takes __ days for conceptus to migrate from fallopian tube into uterus

8

2

when is the fertilized egg independent of environment but not of genetics

pre-embyronic phase
(8 days from fertilization to implant)

3

when is the embryonic phase

weeks 3-8

4

the time when all of the tissues are specializing and organs are forming

Period of Organogenesis

5

when is the Period of Organogenesis

embryonic phase
weeks 3-8

6

-Time when malformations occur and greatest vulnerability to teratogens

Period of Organogenesis during the embryonic phase (weeks 3-8)

7

Embryonic development into what 3 germ layers

1. Ectoderm will become skin and nervous system
2. Mesoderm will become muscle and bone
3. Endoderrm will become GI tract (alimentary canal), endocrine and respiratory systems

8

When can you start to see the heart beat

on 6 week ultrasound

9

When is the fetal phase

9 weeks until delivery

10

What happens during the fetal phase

Further growth, differentiation and maturation of organs

11

when do Pulmonary alveoli begin to develop

24 weeks

12

When does surfactant present in lungs

at 34 weeks

13

What is the importance of surfactant

it reduces the surface tension of lungs to keep the alveoli open so baby can breath

14

What happens if the baby is born before 24 weeks

pulmonary alveoli won't be develooped and the fetus won't be viable outside the womb

15

Fetal membranes and what do they do

Amnion is inner layer
Chorion is outer layer
Function: act to protect fetus from injury and infection

16

What happens when a mother's water breaks

the fused chorion/aminion membrane ruptures and amniotic fluid poors out

17

PROM

prolonged rupture of membranes > 18 hr
*prior to delivery- makes you prone for infection

18

PPROM

premature, prolonged ROM
*breaks prior to 35 weeks of gestation

19

SROM

spontenous ROM

20

AROM

artificial ROM
*can have AROM that becomes PROM

21

What are the functions of amniotic fluid

1. Acts as a cushion for fetus as mother moves
2. Prevents membranes from sticking to baby
3. Allows for fetal movement
4. Necessary for lung development

22

How does the fetus contribute to the placenta

Chorionic villi

23

Finger-like projections of chorion which penetrate into the endometrium, the lining of the uterus

Chorionic villi

24

what does a chorionic villi contain

1. fetal arteriole, venule, and capillary

25

What is the placenta made up of

1. Chorionic villi- fetal contribution
2. Decidua Basalis- maternal contribution

26

What happens when c.villus invades the endometrium

it causes the maternal capillary beds to break down into sinusoids

27

blood flow in placenta

arteriole --> open space --> venule

28

Where is the fetal capillary

sits within the sinusoid and is bathed by maternal blood
*drug transfer occurs this way

29

Mother to fetus exchange across the placenta

oxygen, aminio acids, fats, glucose, some hormones, antibodies, most drugs, viruses

30

Fetus to mother exchange across the fetus

carbon dioxide, bilirubin, ammonia and other waste products