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Flashcards in Embryology Deck (43)
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What gestational age do kidneys develop

Week 12-14

1

Embryo becomes fetus

10 weeks

2

Absent nasal bone

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

11-14weeks

3

Fertilization occurs in ____ 1-2 days after ovulation

Ampulla

4

Sperm + ovum =

Zygote

5

3 days

16 cell morula

6

____ enter uterus 4-5 days

Blastocyst

7

Outer ____surrounds fluid filled cavity ____ and inner cell mass _____

Trophoblast
Blastocele
Embryoblast

8

____ occurs 7-9 days as blastocyst burrows beneath endometrium

Implantation

9

Endometrium. 3 layers.

Decidua capsularis
Decidua Vera
Decidua basalis: maternal contribution to placenta

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

10

Conceptus contribution to placenta

Chorion frondosum

11

3 germ cell

Endoderm
Mesoderm
Ectoderm

12

Folding/fusion of neural tube

23 days

13

C shape, limb buds, ❤️prominence, tail

28 days

14

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

56 days

15

Facial folds fuse

6 weeks

16

YS resorbs

12 weeks

17

Amnion & chorion fuse

14-15 weeks

18

Sac ID

5 weeks
Double sac sign

19

YS ID

5.5 weeks

20

Embryo seen at

6 weeks. Grows 1-2mm/day

21

❤️ beats at

5.5 weeks

22

First organ to function

❤️

Should ID ❤️ beat when CRL > 4 mm

23

Limb buds

7-8 weeks

24

Rhombencephalon

8-11 weeks

25

Amnion ID up to

16-17 weeks

26

Gut herniates

8-12 weeks

27

Spine parallel lines at

8 weeks

28

Cerebral hemispheres & choroid plexus at

9 weeks

29

Digits

11 weeks