Embryonic development in days Flashcards by Nell Cuthbertson

Q

Day 1

A

Fertilisation

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Q

Day 2

A

Two cell stage

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Q

Day 3

A

Morula

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Q

Day 4

A

Early blastocyst

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Q

Day 5

A

Late blastocyst

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Q

Day 6-7

A

Implantation into endometrium of uterus

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Q

Day 8

A

Bilaminar disc forms

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Q

Day 9

A

Trophoblast with lacunae

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Q

Day 10-11

A

Embryo in uterus 10-11 days after ovulation

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Q

Day 12

A

Extraembryonic mesoderm develops

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Q

Day 13

A

Uteroplacental circulation begins

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Q

Day 14

A

Embryonic disc: dorsal view

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Q

Day 15

A

Laterally established

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Q

Day 16

A

Gastrulation: formation of germ layers

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Q

Day 17

A

Epiblast forms germ layers

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Q

Day 18

A

Trilaminar embryoic disc

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Q

Day 19

A

CNS induction

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Q

Day 20

A

Neurulation: neural folds elevate

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Q

Day 21

A

Transverse section through somite region

Q

Day 22

A

Neural tube closure begins

Q

Day 23

A

Neural tube zippers

Q

Day 24-25

A

Villus formation continues in the placenta

Q

Day 26

A

Pharyngeal arches present

Q

Day 27

A

Somites continue to develop

Q

Day 28

A

Neurulation complete

Q

Day 29

A

Arm and leg buds

Q

Day 30

A

Developing face

Q

Day 31

A

Gut development

Q

Day 32

A

Embryo in chorionic cavity

Q

Day 33

A

Umbilical ring

Q

Day 34

A

Optic cup and lens placode

Q

Day 35

A

Branchial arches and clefts

Q

Day 36

A

Physiological umbilical hernia

Q

Day 37

A

Developing face

Q

Day 38

A

Muscle development

Q

Day 39

A

Endodermal derivatives

Q

Day 40

A

Auricular hillocks

Q

Day 41

A

Atrial septum formed

Q

Day 42

A

Digit formation

Q

Day 43

A

Limb cartilages and digital rays

Q

Day 44

A

Developing face

Q

Day 45

A

Conotruncal and ventricular septa

Q

Day 46

A

Q

Day 47

A

External genitalia

Q

Day 48

A

Facial prominences fused

Q

Day 49

A

Digits present, eyelids forming