Anatomy Lecture 7_Embryology week 1-2

Question 1

What are the six abnormal sites of implantation? That is their relative frequency?

Answer 1

1.Ampullary ~80% 2. Tubal ~12% 3. Interstitial (intramural) ~0.2% 4. Abdominal (mesentaric) ~1.4% 5.Ovarian ~0.2% 6. Internal os ~0.2%

Question 2

What is Placenta Previa

Answer 2

The plecenta spans the internal OS

Question 3

What are the amnion, chorion, and placenta characteristics of Dizygotic twins

Answer 3

• Separate amnion (diamniotic)
• Separate chorion (dichorionic), which may fuse
• Separate placenta, which may fuse