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Embryology > Fertilization To Trilaminar > Flashcards

Fertilization To Trilaminar Flashcards

0
Q

What does the sperm penetration of the egg also trigger?

A

Second meiotic division

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1
Q

Go through 4 stages of fertilisation

A

Sperm binds with zona pellucida glycoprotein
Acrosomal enzymes released from sperm head- sorry digests its way into egg
Egg and sperm pm fuse and sperm empties contents into egg
Sperm entry triggers cortical granule release in egg cortex triggering fertilisation membrane formation which is then impenetrable

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2
Q

Fusion of male and female pronuclei is called what?

A

Zygote

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3
Q

What is cleavage

A

Zygote undergoes several mitotic divisions

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4
Q

What are blastomeres?

A

When a fertilised egg subdivides into many smaller daughter cells

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5
Q

What is blastocyst formation?

A

Some mitotic divisions

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6
Q

How long does it take to implant?

A

Up to 6 days

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7
Q

What does the Inner cell mass give rise to?

A

The embryo

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8
Q

What do the other cells give rise to?

A

Trophoblast which contributes to the placenta

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9
Q

Where are embryonic stem cells derived from?

A

ICM

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10
Q

At the 8-12 day mark, what does the syncytiotrophoblast contact

A

Maternal blood supply

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11
Q

Where is the amniotic cavity?

A

Above the embryonic disc

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12
Q

What is below the embryonic disk

A

Yolk sac

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13
Q

What encircles the entire embryo?

A

Chorionic cavity

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14
Q

What are the 2 layers of embryonic disks called?

A

Epiblast

Hypoblast

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15
Q

What 3 layers become of the epiblast and hypoblast?

A

Ectoderm
Mesoderm
Endoderm

16
Q

What does the hypo last become?

A

Endoderm

17
Q

What does the ectoderm turn into?

A

Epidermis of skin

Nervous system

18
Q

What happens to the mesoderm

A

Divided into 3 layers- paraxial, intermediate and lateral plate

19
Q

What happens to the endoderm

A

Becomes the lining of the gut and respiratory tract

20
Q

What does the intermediate mesoderm do?

A

Part of the urogenital system

21
Q

Lateral plate mesoderm?

A

Lining of body wall, limbs ect

Visceral: covering of organs cardiovascular system

Embryology (3 decks)

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