Embryology Flashcards Preview

Systems 1 Anatomy > Embryology > Flashcards

Flashcards in Embryology Deck (24):
1

What is a morula?

After zygote
Solid ball of cells

2

Leber's hereditary optic neuropathy is an example of what?

Mitochondrial disease

3

What makes up a blastocyst?

Trophoblast (outside)
Inner cell mass
Blastocyst cavity

4

The trophoblast forms what for implantation?

Chorion

5

What does the chorion do?

Implantation (chorionic villi)
Forms placenta
Secretes human Chorionic gonadatrophin

6

What happens to the inner cell mass of the trophoblast?

Bilaminar disc
- Epiblast
- Hypoblast

7

What are the functions of the placenta?

Foetal nutrition
Transport of waste and gases
Immune system

8

What forms the maternal part of the placenta?

Decidua basalis of the endometrium

9

What forms in the centre of the epiblast?

Primitive streak (invagination of cells)

10

The epiblast displaces what and forms what?

Displaces the hypoblast
Forms the germ layers
- Ectoderm
- Mesoderm
- Endoderm

11

What is the first thing the ectoderm forms?

Notochord

12

What does the notochord induce?

Sinking of the neural plate to form a neural tube

13

What does the neural tube induce?

Thickening of the mesoderm and separation

14

What does the mesoderm separate into?

Paraxial Mesoderm
Intermediate plate mesoderm
Lateral plate mesoderm

15

What does the lateral plate mesoderm split into?

Somatic mesoderm
Intraembryonic coelom
Splanchic mesoderm

16

What does the paraxial mesoderm form?

Somites

17

What does the intermediate plate mesoderm form?

Urogenital system

18

Neurolation forms what?

43 pairs of somites in paraxial mesoderm

19

The endoderm forms what?

Gut tube
Respiratory

20

The somites divide into what?

Dermatome (dermis of skin)
Myotome (muscle)
Sclerotome (bone)

21

What does ToRCH stand for?

Infections teratogens
Toxoplasmosis
Rubella
Cytomegalovirus
Herpes

22

Where is the risk of teratogenesis greatest?

weeks 3-8

23

How is a prenatal diagnosis of congenital disorders made?

Blood - AFP
Ultrasound (12 weeks)
CVS/amniocentesis

24

How is a postnatal diagnosis of congenital disorders made?

Hip stability
Testicular descent
Fingers and toes
Hearing