Embryonic Dev. Flashcards

(35 cards)

1
Q

Starts in the union of germ cell and when does it end?

A

Fertilization ( cleavage)

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2
Q

Pattern of early mitotic division

A

Cleavage

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3
Q

T/f The size of cell changes in cleavage.

A

f.it does not only the number of cell increase

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4
Q

Formation of the priMary germ layers

A

Gastrulation

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5
Q

What are the types of eggs based on characteristics?

A

Isolecithal, mesolecIthal, telolecithal, centrolecithal

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6
Q

Sparse evenly distributed yolk

A

Isolecithal ( mammals)

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7
Q

Moderate yolk & unevenly distributed

A

. Mesolecithal (amphibians)

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8
Q

Dense yolk concentrated at one end

A

Telolecithal (birds & reptiles)

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9
Q

Yolk concentrated at the middle

A

Centrolecithal (fly)

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10
Q

Fertilization process in chronological order

A

Insemination- sperm capacitation-migration- acrosome reaction- forming of fertilization cone - penetration of sperm. - forming of fertilization membrane- formation of M&f pronuclei - union of m&f chromosomes

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11
Q

Several mitotic divisions and what are the cells called?

A

Cleavage ( blastomere)

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12
Q

A compact ball that have undergone mitotic division.

A

Morula

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13
Q

What junction is a result of cleavage

A

Tight junction

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14
Q

What junction forms the blastocoele

A

Gap junction

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15
Q

What rises off of the superficial layer of the morula?

A

Trophoblast/ trophoectoderm

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16
Q

What attaches the developing embryo to the uterine wall

17
Q

It is a fluid-filled intercellular space which coalesce into a single cavity

A

Blastocyst cavity/ blastocoele

18
Q

When trophoblast, embryoblast, and blastocoele are present, what is it called?

19
Q

What are the three germ layers formed in gastrulation?

A

Ectoderm, mesoderm, endoderm

20
Q

Inner cell mass develops into l. 2.in gastrulation?

A

Epiblast & hypoblast

21
Q

The inner cell mass forms these layers inside the thropoblast.

A

Epiblast& hypoblast

22
Q

The inner cell mass forms these layers inside the thropoblast.

A

Epiblast& hypoblast

23
Q

The invagination of epiblast cells forms?

A

Primitive groove- primitive streak

24
Q

It defines the longitudinal axis of the embryo and indicates the start of germ layer formation

A

Primitive streak

25
The proliferation of epiblast cells along the streak forms what?
Endoderm & mesoderm
26
The initial migrating cells join the hypoblast layer forming-?
Embryonic endoderm
27
The mesoderm divides into?
Paraxial, intermediate, lateral mesoderm
28
The mesoderm splits two layers bordering the coelom in lateral mesoderm
Somatic & splanchnic mesoderm
29
Attached to ectoderm
Somatic mesoderm
30
Joined to endoderm
Splanchnic mesoderm
31
The mesoderm that stream through the primitive streak
Primary mesenchyme
32
Organized cells having a distinct apical and basal surface
Epitheloid
33
The mesoderm that streams through the primitive streak
Primary mesenchyme
34
Temporary epithelioid turns to
Secondary mesenchyme
35
Notochord-induced transformation of ectoderm into nervous tissue
Neurulation