Development Up to 2 Week Flashcards by Ambili P P

Why zygote not undergo apoptosis or programmed cell death

Metabolic activation of zygote

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Explain cleavage of zygote

Double copy of Maternal and paternl chromo. Arranged in metaphase plate.chromatid mve to opposite spindle.furrow,

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How many maternal and paternal chromosome and chromatid in each cleaver zygote

Each has 23 maternal chromosome and chromatid and 23 maternal chromosome and chromatid

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Time need to 2 celled after free fertilization

30 hours

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What mor ula do 4th and 5 th day in uterine caviry

Floating in the uterine fluid

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Implantation in

6 th day or 20th day of menstration

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2 arteries in endometrium and glands formed influence of

Progestron

Basal artery from which spiral artery form

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3 layers of endometrium and which are lost in menstruation and why

Basal layer,spongy layer(blood vessal and gland),compact layer____outer to inner

Spongy layer and compact ayer lost
From basal layer next structures redevelop

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When wbc pass near inflammed blood vessal it stick to its endothelium because

Molecular events there

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Adhesion molecule expressed on trophoblast

Selectin

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What happen after implantation

Blastocysts enzymes and molecular activity cause apoptosis ofendometrial cell more secreation come.endometrial cell polyhedral with glycogen and lipid

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Local change at the site of implantation within the endometrium is called

Decidual reaction

Then this change spread through out the cell

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Loose attachment and powerful attachment of blastocyst to endometrium

Intregrins power . att.

Select in loose attach.

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Fibronettin and laminin help in

Help to migrate within endometrium meanwhile Blastocysts produce lot of digestive enzyme

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9 th day Blastocysts inside endometrium by? Then what

Causing apoptosis

12 th day fibrin plug close implantation site then new mucosal cell appear

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Progressive chang in trophoblast and embryo last in 8 to 12 days

RULE OF TWO
cytotrophoblast develop two layer
Em. B to 2 layer,2 cavity,2 layer extra coelomic cavity

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Significance of embrionic pole

Cytotrophoblast and syntiotropho blst more there

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The new cell from cytotrophoblast outside lost cell membrane and protoplamic mass called and they formed in &they do

Syncitiotrophoblast&8th day&digest some capillary of endometrium(sinusoids-large sized capillary)

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9th &10th day lacunae in syncitiotrophoblast connect and they connect with

Uterine blood(through digested sinusoids.lacunae system some connect to arterial side and some to venous side

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What is uteroplacental circulation and happen in

From high pressure arteriolar side sinusoid to low pressure venule side sinusoid blood flow through lacunae system
11 th and 12th day

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How pregnancy calculation get wrong

On 13th gestational day some bleeding may happen due to utero placental circulation establishment they think as menstration

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Primary villi formed by

Cytotrophoblast

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Contents of bilaminar germ disc it form in

Hypoblast(cuboidal)
Epiblast(columnar)
Amnioblast
Amniotic cavity
Secondary  yolk sac
Chorionic cavity

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The connective tissue by cells derived from hypoblast deposit b/w

Study These Flashcards

Yolksac layer and cytotrophoblast(then form upper also) is called extraembrionic mesoderm

Cavities in extra embrionic mesoderm form

Extraembrionic coelom

Visceral layer aka | Outer layer aka

Splachanic layer | Somatic layer

How secondary trophoblast formed

Between hypoblast and splanchnic layer

Other names of splanchnic layer and somatic layer

Extraembrionic splanchinopluric layer of mesoderm | Extra embrionic somatopluric layer of mesoderm

Extra embryonic coelom called

Chorionic cavty

Chorionic plate

Extraembrionic somatopluric mesoderm,cytotrophoblast,syncytiotrophoblast

Events in 2nd week after secondary yolk sac formation

Epiblast and hypoblast make baby Amniotic cavity surround it and secondary Yolksac disappear.chorionic cavity,umbilical cord connect to chorionic plate.one part of chorionic plate develop towards placenta

Why menstruation not in pregnancy

Syncytiotrophoblast high amt hcg cause corpus luteam to produce more progestron,progestron maintain endometrial layer

Process of conversion of bilaminar disc to trilaminar disc ? And embryo called

Gastrulation | Gastrula

Space where epiblast and hypoblast are very sticky

Prechordal plate

Where cns,mouth opening develop

Prechordal plate

What happen after 2nd week

The central cell proliferate to form primitive streak and primitive node

Cells inside primitive streak and form

Primitive groove

Central depression in primitive node called

Primitive pit

Cells of epiblast proliferate and migrate to

Primitive steak and groove

The special chemical produced by primitive streak and node to attract cells is

Fibroblast growth factor 8

Cells that replace hypoblast form

Endoderm

Another generation of cells start developing,cell layer derived from epiblast and present between endoderm and epiblast

Mesoderm

Remaining part of epiblast which already made endoderm,mesodrm and notochord

Ectoderm

Fibroblast g.f 8 inhibit the production of sticky molecule like

E cadherin

Cells move through primitive streak also move forward . cephalic part of epiblast----

Only gaining cells not loosing cells

Process of gastrulation more active on

Caudal part

Endodermal cell and mesodermal cell move forward and form

Disc like stree with more cell in cephalic end

In primitive node cells move in circular patter and form

Tube in central part of disc up to prechordal plate

What happen to tube when reach prechordal plate

There upper and lower layer cells strongly held togather so this tube cant move forward

Tube start from primitive pit to prechordal plate

Notochordal tube or notochordal canal

Notochordal tube pass through

Below epiblast above endoderm

Mesoderm present between ectoderm and endoderm except

Prechordal plate&buccopharyngeal membrane Cloacal plate Notochordal process

Cloacal plate form

Anus

Buccopharyngeal and prechordal plate form

Mouth

Skin is ectoderm and mucosa endoderm and they meet each other in

Mouth and anus

Around notochordal tube or notochordal process what develop

Vertebra

Notochordal tube open to amniotic fluid.floor of tube process fuses with endoderm and both distntegrate then what

Tail of spence in arxilla is

Anterior group of lymph node

Development Up to 2 Week Flashcards

(58 cards)