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Flashcards in Embryology Deck (49)
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1

What is embryology?

The study of progression from a single cell to a baby in 9 months

2

What is special about zebra fish?

Translucent eggs that are outside the mother
Sequenced genome
Study birth defects

3

Where does fertilisation take place?

Ampullary region of the fallopian tube

4

How long is a sperm viable for?

5 days

5

How long is a secondary oocyte viable for?

12-24 hours

6

Why aren't sperm rejected as they are foreign bodies?

Antibodies only form if the sperm gets in contact with the blood
Tight junctions stop sperm passing into blood

7

When is the germinal stage?

Fertilisation to the end of the second week

8

When is the embryonic period?

Beginning of third week till the end of the eighth week

9

When is the Foetal period?

Beginning of ninth week to birth (38 weeks)

10

What is the Zona Pellicuda?

Stops the blastocyte from adhering to oviduct
The loss of it is called hatching

11

What does trophoblast mean?

Food bud- becomes the yolk sac and placenta

12

What is Histiotrophic nutrition?

Nutrition provided to the embryo not from the maternal blood
Before week 12

13

What is haemoptrophic nutrition?

Nutrition provided by the mothers blood
After week 12

14

What is the implantation site?

Site of formation the placenta
Usually upper part of the body of the uterus in the posterior wall

15

What is an ectopic pregnany?

Fetus develops outside the Uterus

16

What is placenta previa?

Placenta blocks the neck of the uterus so interferes with delivery

17

What is Syncytium?

Together cells

18

What is syncytiotrophoblast?

Cells that merge together in the trophoblast

19

What is Cytotrophoblast?

Cells in the trophoblast

20

What happens in the second week of development?

Trophoblast differentiates into 2 layers
Embryoblast forms 2 layers- epiblast and hypoblast
Hypoblast forms the yolk sac and chorionic cavity

21

What happens during the embryonic period?

All major systems and structures are formed

22

When is the greatest risk of major congenital malformations?

Embryonic period

23

What are the key events and processes in early development?

Fertilisation and implantation
Gastrulation
Neurulation
Segmentation
Folding

24

Where do new features appear in the third week?

Dorsal surface of the epiblast

25

What is an ectoderm?

Organs and structures that maintain contact with outside world

26

What is a mesoderm?

Supporting tissues

27

What is an endoderm?

Internal structures

28

What is Situs inversus?

Complete mirror image viscera
Commonly results from immotile cilia
No associated morbidity
Problem arise if normal and mirror image disposition

29

What are the clear right and left body differences?

Liver on the right
Stomach and spleen on the left
Left lung has 2 lobes
Right lung has 3 lobes

30

When is Gastrulation?

Third week