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67 Cards in this Set
- Front
- Back
Where do primordial germ cells come from? |
From the epiblast |
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When are primordial germ cells formed? |
in the 2nd week of pregnancy |
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When do primordial germ cells reach the wall of the yolk sac? |
in the 4th week |
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When do primordial germ cells allow the gonads to differentiate? |
at the end of the 6th week |
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When does oogenesis start? |
in the 3rd intrauterine month |
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when does spermatogenesis start? |
at puberty |
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How long does it take for a primary spermtocyte to become a mature sperm? |
74 days |
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Viability of ovum |
12-24 hours |
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Viability of sperm |
4-6 days |
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When does the number of primordial follicles peak at 7 million? |
In the 5th intrauterine month |
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At birth, how many primordial follicles does a female have? |
6-8 hundred thousand |
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How many primordial follicles are left by the time a girl reaches puberty? |
4 thousand |
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Corpus luteum continues to exist until the _______ month |
4th |
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When does the corpus luteum degenerate (when there's no fertilization)? |
After 9 days |
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When does implantation happen? |
On the 3rd/4th day after fertilization |
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How long does capacitation take? |
7 hours |
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When does the morula enter the uterine cavity |
on the 3rd/4th day after fertilization |
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When does the blastocyst begin adhering to the wall of the uterus? |
on the 4th/5th day |
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When is the fibrin coagulum formed? |
On day 9 |
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What's a blastomere? |
a stem cell |
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When is the embryo fully implanted into the endometrium? |
day 13 |
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When are the primary villi formed? |
day 13 |
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When does the primitive streak appear? |
at the beginning of the 3rd week (days 15/16) |
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When does the primitive streak disappear? |
At the end of the 4th week |
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When does the anterior neuropore close? |
Day 25 |
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When does the posterior neuropore close? |
Day 28 |
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Characteristic features of a 4 week-old embryo |
lens placode otic placode pharyngeal arches somites tail umbilical cord heart bulge limb ridge |
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How long does physiological umbilical hernia last? |
weeks 6-12 |
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When do the first somites appear? |
day 20 |
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Til when do we keep getting new somites? |
end of 5th week |
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When does the buccopharyngeal membrane rupture? |
in the 4th week |
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When does the cloacal membrane rupture? |
in the 7th week |
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What does the allantois do? |
it helps form the urinary bladder and rectum |
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What separates the pleura from the peritoneum? |
The pleuro-peritoneal membrane |
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What separates the pericardium from the pleura? |
Pleuro-pericardial membrane |
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What do the pericardio-peritoneal canals help from? |
The pleura |
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How do we calculate the due-date? |
280 days/ 40 weeks after the last normal period |
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When does the growth of the head slow down in comparison to the rest of the body? |
at the beginning of the 3rd month |
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A whitish fattymaterial is deposited on the fetus’s body by sebaceous glands in the finalmonth ...? |
Vernix caseosa |
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weight of baby at 5 months |
>500 gm |
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wight of full term baby |
3-3.4 kg |
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CRL of baby at 5 months |
15 cm |
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CRL of full-term baby |
36 cm |
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CHL of full-term baby |
50 cm |
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When is subcutaneous fat formed? |
after 7 months |
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Placenta comes entirely from fetus |
Hemochorial placenta |
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Baby swallows ________ ml of amniotic fluid |
400 ml |
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When can preeclampsia happen? |
20 weeks pregnant to full term |
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Diameter of a full-term placenta |
15-20 cm |
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Thickness of full-term placenta |
3cm |
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Weight of full-term placenta |
500-600 gm |
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Filamentous placenta |
umbilical cord inserted not onto the placenta, but onto a chorionic membrane to the side |
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How many cotyledons on the maternal side of the placenta? |
20 |
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How many spiral arteries empty their blood into intervillous spaces? |
80-100 |
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When are adult levels of IgG reached? |
at the age of 3 |
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When is hCG produced? |
in the first 2 months of pregnancy |
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What;s placental lactogen? |
somatomammotropin |
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Amniotic fluid at 10 weeks |
30 ml |
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Amniotic fluid at 20 weeks |
450ml |
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Amniotic fluid at 37 weeks |
800-1000ml |
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What's alphafetoprotein hormone? |
a hormone that's checked for in amniocentesis, its existence usually indicates congenital anomalies |
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How much amniotic fluid in polyhydraminos? |
1.5 liters or more |
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How much amniotic fluid in oligohydraminos? |
less than 400 ml |
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Diameter of a full-term umbilical cord |
1-2 cm |
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Length of a full-term umbilical cord |
50-60cm |
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probability of twins occurence |
3% |
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about 2/3 of twins are |
dizygotic twins |