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67 Cards in this Set

  • Front
  • Back

Where do primordial germ cells come from?

From the epiblast

When are primordial germ cells formed?

in the 2nd week of pregnancy

When do primordial germ cells reach the wall of the yolk sac?

in the 4th week

When do primordial germ cells allow the gonads to differentiate?

at the end of the 6th week

When does oogenesis start?

in the 3rd intrauterine month

when does spermatogenesis start?

at puberty

How long does it take for a primary spermtocyte to become a mature sperm?

74 days

Viability of ovum

12-24 hours

Viability of sperm

4-6 days

When does the number of primordial follicles peak at 7 million?

In the 5th intrauterine month

At birth, how many primordial follicles does a female have?

6-8 hundred thousand

How many primordial follicles are left by the time a girl reaches puberty?

4 thousand

Corpus luteum continues to exist until the _______ month

4th

When does the corpus luteum degenerate (when there's no fertilization)?

After 9 days

When does implantation happen?

On the 3rd/4th day after fertilization

How long does capacitation take?

7 hours

When does the morula enter the uterine cavity

on the 3rd/4th day after fertilization

When does the blastocyst begin adhering to the wall of the uterus?

on the 4th/5th day

When is the fibrin coagulum formed?

On day 9

What's a blastomere?

a stem cell



When is the embryo fully implanted into the endometrium?

day 13

When are the primary villi formed?

day 13

When does the primitive streak appear?

at the beginning of the 3rd week (days 15/16)

When does the primitive streak disappear?

At the end of the 4th week

When does the anterior neuropore close?

Day 25

When does the posterior neuropore close?

Day 28

Characteristic features of a 4 week-old embryo

lens placode


otic placode


pharyngeal arches


somites


tail


umbilical cord


heart bulge


limb ridge

How long does physiological umbilical hernia last?

weeks 6-12

When do the first somites appear?

day 20

Til when do we keep getting new somites?

end of 5th week

When does the buccopharyngeal membrane rupture?

in the 4th week

When does the cloacal membrane rupture?

in the 7th week

What does the allantois do?

it helps form the urinary bladder and rectum

What separates the pleura from the peritoneum?

The pleuro-peritoneal membrane

What separates the pericardium from the pleura?

Pleuro-pericardial membrane

What do the pericardio-peritoneal canals help from?

The pleura

How do we calculate the due-date?

280 days/ 40 weeks after the last normal period
266 days/ 38 weeks after fertilzation

When does the growth of the head slow down in comparison to the rest of the body?

at the beginning of the 3rd month

A whitish fattymaterial is deposited on the fetus’s body by sebaceous glands in the finalmonth ...?

Vernix caseosa

weight of baby at 5 months

>500 gm

wight of full term baby

3-3.4 kg

CRL of baby at 5 months

15 cm

CRL of full-term baby

36 cm

CHL of full-term baby

50 cm

When is subcutaneous fat formed?

after 7 months

Placenta comes entirely from fetus

Hemochorial placenta

Baby swallows ________ ml of amniotic fluid

400 ml

When can preeclampsia happen?

20 weeks pregnant to full term

Diameter of a full-term placenta

15-20 cm

Thickness of full-term placenta

3cm

Weight of full-term placenta

500-600 gm

Filamentous placenta

umbilical cord inserted not onto the placenta, but onto a chorionic membrane to the side

How many cotyledons on the maternal side of the placenta?

20

How many spiral arteries empty their blood into intervillous spaces?

80-100

When are adult levels of IgG reached?

at the age of 3

When is hCG produced?

in the first 2 months of pregnancy

What;s placental lactogen?

somatomammotropin

Amniotic fluid at 10 weeks

30 ml

Amniotic fluid at 20 weeks

450ml

Amniotic fluid at 37 weeks

800-1000ml

What's alphafetoprotein hormone?

a hormone that's checked for in amniocentesis, its existence usually indicates congenital anomalies

How much amniotic fluid in polyhydraminos?

1.5 liters or more

How much amniotic fluid in oligohydraminos?

less than 400 ml

Diameter of a full-term umbilical cord

1-2 cm

Length of a full-term umbilical cord

50-60cm

probability of twins occurence

3%

about 2/3 of twins are

dizygotic twins