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OB > Fetal Growth And Development > Flashcards

Fetal Growth And Development Flashcards

1
Q

Gestational age

Usually how many weeks before ovulation and fertilization?

A

2 weeks

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2
Q

Gestational age

How many weeks before blastocyst implantation

A

3 weeks

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3
Q

Embryologist describe embryo fetal development using this or the time in days or weeks from ovulation.

A

Ovulation age

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4
Q

Nearly identical to ovulation age

A

Postconceptional age

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5
Q

Between first day of LMP and the birth

A

289 days or 40 weeks

9 and 1/3 calendar months

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6
Q

Quick estimate of EDC

A

Naegele rule

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7
Q

Zygote and blastocyst development

How many weeks after ovulation?

A

First 2 weeks

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8
Q

Zygote and blastocyst development

Implantation, how many days before fertilization?

A

6-7 days

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9
Q

Zygote and blastocyst development

How many embryo producing cells (inner cell mass)

A

5 embryo

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10
Q

Zygote and blastocyst development

How many cell from the placental trophoblast?

A

53 cells

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11
Q

Embryonic period

A

3 rd week after ovulation and fertilization

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12
Q

Embryonic period

Formation of what? That coincides with the expected day of menses

A

Primitive chorionic villi

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13
Q

Embryonic period

Last how many weeks

A

8 weeks

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14
Q

Embryonic period

Takes place

A

Organogenesis

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15
Q

3rd week

A 
Positive pregnancy test ( 35 days or 5th week)
Embryonic disc
Body stalk
1cm chorionic sac
Fetal blood vessel in chorionic villi
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16
Q

4th week

A 
CVS
True circulation ( chorionic villi and embryo )
Chorionic sac 2-3 cm
Arm and leg bud
Amnion
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17
Q

6th week

A 
22-24 cm in lenght
Head> trunk
Heart is complete
Finger and toes 
Arms bend at the elbows
Lip and ears
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18
Q

Fetal period

A

8 weeks after fertilization
10 weeks after LMP
Embryo 4cm long
CRL

19
Q

Correspond to the sitting height are most accurate for dating.

A

Crown to rump lenght

20
Q

12 gestational weeks

A 
Uterus in symphisis pubis
CRL 6-7 cm
Center of ossification
Differentiate finger and toes
Skin and nails
Fetal movt
Beginning to show gender
21
Q

16 gestational weeks

A 
CRL 12cm
110 g
14 weeks - determined gender
16-18 weeks- eye movement 
Uterus- between symphisis pubis and umbilicus
Midbrain
22
Q

20 gestational weeks

A 
Midpoint
Fetus move every minute
\+quickening
Fetal skin less transparent
Downy lanugo
Scalp hair is developed
23
Q

Cochlear function develops between

A

22-25 weeks and maturation continues 6 months after delivery

24
Q

24 gestational weeks

A 
Wt. 630 g
Fat deposit begin
Large head 
Eyebrow and eyelashes
Canalicular period of lung nearly  completed
25
Q

24 weeks fetus born this time will attempt to breathe but most will die because

A

Terminal sacs have not yet formed

26
Q

28 gestational weeks

A 
CRL - 25 cm
1100 g
Vernix caseosa
Disappeared pupillary membrane
Blinking
90% of survival if born
27
Q

32 gestational weeks

A

CRL- 28 cm
1900 g
Skin is still red and wrinkled

28
Q

36 gestational weeks

A

CRL - 32cm
2500 g
Subcutaneous fat deposition
Lost of wrinkled face

29
Q

40 gestational weeks

A 
Term
Fetus is fully developed
CRL - 36 cm
3400g
2500 most Filipinos

Full termed is (37-42 weeks)2

30
Q

Placental physiology and fetal growth

Fetal blood contained in the?
Maternal blood remains in the?

A

Fetal capillaries of chorionic villi
Intervillous space

No direct communication between them

31
Q

Placental physiology and fetal growth

Bidirectional transfer depends on the processes that permit or aid the transport through the

A

Syncytiotrophoblast that line the chorionic villi

32
Q

Placental physiology and fetal growth

There are occasional breaks in the chorionic villi which permit escape of fetal cells into the maternal circulation

A
  • women by + fetus
    Chimerism
    Maternal autoimmune diseases
33
Q

Maternal blood within this space is the primary unit of maternal- fetal transfer

A

Intervillous space

34
Q

Function together as the fetal lung GIT and kidney

A

Chorionic villi

Intervillous space

35
Q

Placental physiology and fetal growth

Utero placental BF near term is

A

700-900 ml/min

36
Q

Reduce blood flow into the Intervillous space with the degree depending on the contraction intensity

A

Active labor contraction

37
Q

Regulate maternal and fetal blood flow

A

Syncytiotrophoblast

38
Q

Maternal facing syncytiotrophoblast surface is char theorized by

A

Complex micro villus structure

39
Q

Fetal facing basal cell membrane is the site for transport from the

A

Intravillous space into fetal blood

40
Q

Most substance with mass

A

Simple diffusion like

O2, CO2, water, most electrolytes and anesthetic gases

41
Q

Cross the placenta but very slow

A

Insulin
Steroid hormones
Thyroid hormones

42
Q

Hormones synthesized in situ in the trophoblasts enter both the

A

Maternal and fetal circulation but not equally

43
Q

Transferred by way of a specific trophoblast receptor mediated mechanism

44
Q

Gestational age

Also called

A

Menstrual age

OB (6 decks)

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