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Old 08-15-2011
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Zygote Embryologic Development when the period missed!

A 31-year-old female presents to her gynecologist having just missed her period. With which point of fetal development does her first missed period correlate?
A. Blastocyst formation
B. Fertilization
C. Heart development
D. Gastrulation
E. Upper and lower extremity buds begin to form
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Missed period usually noticed after 4 weeks,

4 weeks = 4 chambers of heart so:

C. Heart Development
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c) Heart development ?
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Default week 3

Within week 3- Gastrulation, premitive streak, notochord forms
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the correct answer is gastrulation
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Quote:
Originally Posted by ricko335 View Post
the correct answer is gastrulation
But a normal menstrual cycle is 28 days = 4 weeks.

I think the woman would notice it first AFTER her usual 28 days dont you think so?
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Old 08-16-2011
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Quote:
Originally Posted by patelMD View Post
But a normal menstrual cycle is 28 days = 4 weeks.

I think the woman would notice it first AFTER her usual 28 days dont you think so?
Yes she misses the period after around a month but that does not mean the baby has been developing for 4 weeks.
Ovulation and conception occurs 2 weeks after the LMP.
So at the time she misses the period the embryo has been only two weeks age.
Gastrulation starts at week 3.
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Old 08-16-2011
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I agree week 3

Quote:
Originally Posted by patelMD View Post
But a normal menstrual cycle is 28 days = 4 weeks.

I think the woman would notice it first AFTER her usual 28 days dont you think so?
Fertilization occurs on 14th day of menstrual cycle and after 2 weeks women should expect menstruation without fertilization. In this case the patient had just missed a period which belongs to approximately 3 weeks after fertilization.
Therefore the correct period is 3 weeks and refers to Gastrulation.
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So what I understood was:

LMP + 2 weeks = gastrulation period (3rd week)

LMP + 4 weeks = cardiac growth (4th week etc)

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if it was after 4 weeks then answer C & E are both correct
so i think it's answer D is the correct one
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Quote:
Originally Posted by patelMD View Post
So what I understood was:

LMP + 2 weeks = gastrulation period (3rd week)

LMP + 4 weeks = cardiac growth (4th week etc)

Dude
LMP + 2 weeks is the time zero, it's when fertilization occurs.
LMP + 4 weeks means embryo is now 2 weeks old.
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Thumbs Up You are right

Quote:
Originally Posted by mmtj View Post
if it was after 4 weeks then answer C & E are both correct
so i think it's answer D is the correct one
Exactly,
You are deploying this strategy
Two Similar Options Are Wrong
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Quote:
Originally Posted by laithbv View Post
Dude
LMP + 2 weeks is the time zero, it's when fertilization occurs.
LMP + 4 weeks means embryo is now 2 weeks old.
Oh right,

LMP + 2 weeks = fertilization then another 3 weeks down you would have gastrulation.
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Quote:
Originally Posted by ricko335 View Post
A 31-year-old female presents to her gynecologist having just missed her period. With which point of fetal development does her first missed period correlate?
A. Blastocyst formation
B. Fertilization
C. Heart development
D. Gastrulation
E. Upper and lower extremity buds begin to form
so simple dude.... missed menstraul period so two weeks have passed coz ovulation at 14th day and then after 28 day menses starts so she noticed missed mensus . so 14 days have passed and for two weeks blastocyst is the right option rule of 2 ... two layers two cavities..
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guys this is the logic i used..correct me if im wrong...it sud actually be 2 layers wid epiblast n hypoblast formation...but the option is not there...
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D. Gastrulation
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What is the correct answer, plz?
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