Embryology

Question 0

Embryo becomes fetus

Answer 0

10 weeks

Question 1

What gestational age do kidneys develop

Answer 1

Week 12-14

Question 2

Absent nasal bone

Answer 2

Assoc with tri 21, small nose, tricuspid regurgitation, aneuploidy

11-14weeks

Question 3

Fertilization occurs in ____ 1-2 days after ovulation

Answer 3

Ampulla

Question 4

Sperm + ovum =

Answer 4

Zygote

Question 5

3 days

Answer 5

16 cell morula

Question 6

____ enter uterus 4-5 days

Answer 6

Blastocyst

Question 7

Outer ____surrounds fluid filled cavity ____ and inner cell mass _____

Answer 7

Trophoblast
Blastocele
Embryoblast

Question 8

____ occurs 7-9 days as blastocyst burrows beneath endometrium

Answer 8

Implantation

Question 9

Endometrium. 3 layers.

Answer 9

Decidua capsularis
Decidua Vera
Decidua basalis: maternal contribution to placenta

Double sac: early sign of pregnancy. Decidua Vera & chorionic villi

Question 10

Conceptus contribution to placenta

Answer 10

Chorion frondosum

Question 11

3 germ cell

Answer 11

Endoderm
Mesoderm
Ectoderm

Question 12

Folding/fusion of neural tube

Answer 12

23 days

Question 13

C shape, limb buds, ❤️prominence, tail

Answer 13

28 days

Question 14

Embryo well formed. Digits, tail absent, gut herniation, large head.

Answer 14

56 days

Question 15

Facial folds fuse

Answer 15

6 weeks

Question 16

YS resorbs

Answer 16

12 weeks

Question 17

Amnion & chorion fuse

Answer 17

14-15 weeks

Question 18

Sac ID

Answer 18

5 weeks

Double sac sign

Question 19

YS ID

Answer 19

5.5 weeks

Question 20

Embryo seen at

Answer 20

6 weeks. Grows 1-2mm/day

Question 21

❤️ beats at

Answer 21

5.5 weeks

Question 22

First organ to function

Answer 22

❤️

Should ID ❤️ beat when CRL > 4 mm

Question 23

Limb buds

Answer 23

7-8 weeks

Question 24

Rhombencephalon

Answer 24

8-11 weeks

Question 25

Amnion ID up to

Answer 25

16-17 weeks

Question 26

Gut herniates

Answer 26

8-12 weeks

Question 27

Spine parallel lines at

Answer 27

8 weeks

Question 28

Cerebral hemispheres & choroid plexus at

Answer 28

9 weeks

Question 29

Digits

Answer 29

11 weeks

Question 30

Fetal period begins

Answer 30

10 weeks

Question 31

Second trimester

Answer 31

13-26 weeks

Question 32

Third trimester

Answer 32

27-42 weeks. (40 weeks term)

Question 33

Spine vertebrae ID

Answer 33

16 weeks. Trvs imaging is gold standard.

Question 34

Kidneys ID

Answer 34

15-17 weeks | Pelvis should be < 1 cm after 30 weeks.

Question 35

Genitalia error rate

Answer 35

3%

Question 36

Cervical length incompetent length

Answer 36

< 3cm | 50-75% of image. Perpendicular.

Question 37

AFI

Answer 37

Uterus should be above umbilicus. Done at > 20 weeks. 4 quads. Normal = 8-22cm Oligohydramnios = < 5cm Polyhydramnios = > 22cm

Question 38

Viability age

Answer 38

24 weeks

Question 39

Callen best ❤️ images

Answer 39

20-22 weeks

Question 40

Lungs mature

Answer 40

37 weeks

Question 41

Pelvis AP < 1 cm at

Answer 41

30 weeks

Question 42

Bladder changes every

Answer 42

Hour