(A) GENERAL EMBRYOLOGY - 1.Developmental Timeline

Question 1

Embryonic peroid

Answer 1

3-8 weeks

(Usually from the day of ovulation/Fertilization as conceptus is formed from the day of Fertilization/ovulation not from LMP)

(From LMP it is +2 weeks)

Question 2

Pre embryonic peroid

Answer 2

Before 3 weeks

Question 3

Fetal peroid

Answer 3

8-38 weeks

Question 4

Implantation occurs on which day of ovulation

Answer 4

7th day

Question 5

The day of ovulation is….the day of…?

Answer 5

The day of fertilization.

Fertilization should occur within 24 hrs of ovulation. So Fertilization happens the very same day of ovulation

Question 6

Gestational age from (LMP) last menstrual period (The 1st day of cycle) or menstrual age is

Answer 6

40 weeks (from LMP or 1st day of cycle)

Question 7

Obstetrician follows

Answer 7

Gestational age / Menstrual age

40 weeks (280 days) from LMP.

Question 8

Embryologist/Radiologist follows

Answer 8

Ovulation / Fertilization age or Post conceptional age.

38 weeks (from the day of ovulation)=14th day of cycle