Developmental biology part 3 : Gastrulation

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Gastrulation is a phase early in the embryonic development of most animals, during which the single-layered blastula is reorganized into a trilaminar ("three-layered") structure known as the gastrula. These three germ layers are known as the ectoderm, mesoderm, and endoderm.[1][2]
Gastrulation takes place after cleavage and the formation of the blastula and primitive streak. Gastrulation is followed by organogenesis, when individual organs develop within the newly formed germ layers.[3] Each layer gives rise to specific tissues and organs in the developing embryo. The ectoderm gives rise to epidermis, and to the neural crest and other tissues that will later form the nervous system. The mesoderm is found between the ectoderm and the endoderm and gives rise to somites, which form muscle; the cartilage of the ribs and vertebrae; the dermis, the notochord, blood and blood vessels, bone, and connective tissue. The endoderm gives rise to the epithelium of the digestive system and respiratory system, and organs associated with the digestive system, such as the liver and pancreas.[4] Following gastrulation, cells in the body are either organized into sheets of connected cells (as in epithelia), or as a mesh of isolated cells, such as mesenchyme.[2][5]
The molecular mechanism and timing of gastrulation is different in different organisms. However, some common features of gastrulation across triploblastic organisms include: (1) A change in the topological structure of the embryo, from a simply connected surface (sphere-like), to a non-simply connected surface (torus-like); (2) the differentiation of cells into one of three types (endodermal, mesodermal, and ectodermal); and (3) the digestive function of a large number of endodermal cells.[6]
Lewis Wolpert, pioneering developmental biologist in the field, has been credited for noting that "It is not birth, marriage, or death, but gastrulation, which is truly the most important time in your life."
The terms "gastrula" and "gastrulation" were coined by Ernst Haeckel, in his 1872 work "Biology of Calcareous Sponges".[7]
Although gastrulation patterns exhibit enormous variation throughout the animal kingdom, they are unified by the five basic types of cell movements that occur during gastrulation: 1) invagination 2) involution 3) ingression 4) delamination 5) epiboly.[8] Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia.
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[@tenalir.k.fanclub1592]

This video is very important for me because I m student of bsc second year (zoology) and there is unit (devlopment biology)
This video really helps me to understand them
Thank you so much sir

[@shomusbiologyofficial]

Glad it helped

[@shikhasingh6502]

I'm also bsc 2 Nd year student ..it also help me 😃

[@zeenuafreen1918]

Me bhi 2nd year student ho ....I think mjhe bhi dekhna chahiye 🤔

[@bryanraphael]

You are better than my professor for sure. She assume all of us to know this in five minutes

[@hernytan]

Hi! I just wanted to say that I think your lectures are a lifesaver! I didn't understand Gastrulation at all and no online website could deliver it as clearly as you did.
Thanks so much!

[@gibcote]

I think "reducing blastocoel" was accidently labeled "archenteron".. just an observation. You are a gifted teacher. :)

[@priyankamahato1687]

True....I was thinking the same...

[@doctorshanky2470]

Yaaa... Right

[@_VivekSharma-mj9he]

Absolutely the archenteron and blastocoel are 2 different region ,bllastocoel is already present while during motion archenteron is formed later

[@rekhajalandra7577]

Explanation was good but I think you should review the archenteron where you have labelled it

[@npandey4264]

thanks shomu...your explanation is awesome as always...

[@arunakapalinee3623]

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[@shomusbiologyofficial]

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[@shireennazeer7510]

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[@shomusbiologyofficial]

+Sheerin S thank you. Glad you liked my lectures. Please subscribe and share

[@hananalmutairi3415]

.Great and useful explaining , Thanks

[@rsorang2225]

In developemental biology part 2 , you said Endoderm gave rise to blood circulation, respiratory and digestive system but here blood circulation comes under Mesoderm . Pls enlighten me.

[@anupamdas487]

Blood circulation comes under mesoderm...where as lining of blood vessels under endoderm

[@ipsitakar4348]

Ectoderm - brain , spinalcord , epidermis , sensory organs .
Mesoderm -( imp) connective tissues , blood , muscle , skeletal system , heart , kidney , ovary , testis (gonads)
Endoderm - as it surrounds the archenteron , the future gut gives rise to digestive system & respiratorysystem .

[@shabeena92]

Sir, i m confused by one question ie is
Q;
At the end of gastrulation which layer is formed??

[@prettyvibesnmore]

thankyou sir , this will definitly gona help me in CSIR

[@ravindranathkamath1577]

Hai I am a Medical Student....You are actually amazing....
The way how you have thought Gastrulation part of Embryology is very important cum interesting ....
U have cleared my doubts nd helped me overcome my fear of Gastrulation topic....Thank You Very Much....:-) :-)

[@Wordboost087]

Which layer is formed at the end in gastrulation??. Sir plz btaye.. With explanation...

[@tahseenjaved1047]

Sir please also explain the proces of convergent extention of dorsal mesoderm

[@polurunagireddy8913]

Nice explanation I felt so good about the topic

[@areebagul1913]

Lovely explanation!! Thank you so much! Love your videos!

[@shomusbiologyofficial]

You're welcome

[@amrita4565]

As always Awesomeness overloaded sir...... Just the best😆😍

[@shomusbiologyofficial]

Thank you. Glad you liked my lectures

[@subhashreepati7512]

The way of description is very good...bt I think the labelling of archenteron is not perfectly done

[@zainabraza359]

Thank you so much for making it so easy
The best teacher ever 👌👌👌

[@silversand9097]

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U are the best teacher forever

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[@shomusbiologyofficial]

Glad to hear that you're getting benefit from my lectures

[@upayanghosh8343]

the bottle cell is itself a cell ? if yes then how is it leading the way of formation of the layers ? is the the bottle cell deviding itself ? and is not cell movement in this case is done by actin filament contraction ?

[@jobsyjose625]

U explain well and the teaching was very good.....just that u cud be a bit more organized in your way of teaching...

[@daizya1232]

Please make video on pleurotus OSTREATUS.

[@narojr5146]

sir how about the endocrine glands? which layer forms it?brain is also formed by the ectoderm?

[@debjanichakraborty8733]

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[@kumararun720]

Excellent effort Nice jobh thank u 🙏

[@misbahhussain1021]

Sir y movement of cells fallows anticlockwise path...

[@nomsamhosira3515]

Thank you. May i get the chicken egg embryo development.

[@shomusbiologyofficial]

Glad to hear that you're getting benefit from my lectures

[@learnwithfun9171]

Nice way to explanation.....
nice video sr.. thank you

[@frankmsangi8415]

Understood sir ! Good presentation

[@AshishMishra-gz1in]

Is it for frog also

[@alizo3]

Thank you Sir

[@shomusbiologyofficial]

You're welcome

[@TheRickfs]

can you explain one for mammals?

[@saidharani6731]

Tq sooo much Sir 🙏🙏🙏

[@shomusbiologyofficial]

You're welcome

[@sonalisuchismita5615]

sir plz upload primodialgermcell migration in drosophilla, zebrafish, frog and mammals

[@gnyanashreesaikia4569]

Thank you...its so useful.

[@sasikalamuthusamy2385]

Please give more videos about 11th biology

[@kyns3946]

Is this good enough for csir net preparation?

[@shomusbiologyofficial]

Yes

[@priyankabaidya1753]

hllo soumu u r really a talented person r u a student of botany

[@ranis9615]

Anyone please help me explain about this dorsal lip

[@SolaScriptura49]

Excellent video!!

[@tayyabgujjar4581]

Great teacher

[@swapnadas9335]

Blastocoel is converted to Archenteron?? 🤔

[@shomusbiologyofficial]

No. The pore folds inside that forms archenteron.

[@swapnadas9335]

@@shomusbiologyofficial Am Sorry, I asked that question coz the diagram showed something like that... That misguided Me 😊

[@Fit_boy_suman]

Sir Purota bujhlam but 19:20 te ektu gulia gelo

[@sachinbio4504]

Thanx ☺️

[@shomusbiologyofficial]

You're welcome

[@Krish-fx9ss]

Perfect piece

[@arkadas6744]

excelent language of biological term

[@vishalgiradkar6372]

Thank you so much sir for such easy explanation

[@shomusbiologyofficial]

You're welcome

[@wondersandy]

Good job. Thanks

[@anithasarathlal9683]

Very useful, thank you

[@shomusbiologyofficial]

+anitha sarathlal you're welcome

[@moitrayeesarkar2898]

Your explanation is good but you keep repeating a lot of things.

[@shrutivajpai8953]

Yes
True

[@akashsaha3956]

Thank u sir.....nice...

[@shomusbiologyofficial]

You're welcome

[@akashsaha3956]

@@shomusbiologyofficial sir plzz make a video on umbrella species

[@Sam-ir6iu]

Great job

[@TheSdzfr]

Useful thank you

[@eqlemaroshanye6566]

Thank you!

[@UsmanKhan-it9dg]

nice explaination

[@shomusbiologyofficial]

+Usman Khan you're welcome

[@nandinijena3202]

This is only for frog???????

[@shomusbiologyofficial]

Yes

[@sujithapriyask4551]

thank you

[@CallmeDais]

Thanks for your help! :)

[@mattspyro]

Thanks!

[@gaurabktm6358]

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[@evindumoragoda4133]

cool!!!

[@itsamitkumar_g5216]

Nice explain sir

[@shabinawaris4435]

waoo well explained

[@afifarabnawaz858]

Thanks sir

[@misbahhussain1021]

Thank u sir

[@28sweety82]

Sir notes provide KR skte ho

[@shomusbiologyofficial]

No

[@happylearningwithsumita]

thanku

[@happylearningwithsumita]

provide gastrulation in chick development.. plss

[@soumyabharatibabu3670]

Very confusing

[@KeshavKumar-nn8pz]

Sir please hinde me discraib

[@priyankabaidya1753]

or zoology

[@AshtangaAyurveda_Study-hp8qk]

Hindi language bhi use kro sir plz

[@hasanshawon8777]

I need chicken leg development...plz help

[@shomusbiologyofficial]

+The Spiderman I will make video lecture on chicken development soon.

[@GESGujjarpur1206]

He doesnot know the way of teaching he was himself so confused

[@inspireX1]

bindia arora He tried his best 😊

[@shireennazeer7510]

If you have the guts.... So you make your own videos..bindia. Don't criticize others....😏
Our sir is the best....👍👍

[@shilpiyadav1010]

bindia arora

[@salendrakumarbarmaniya8906]

You aren't getting gratulation explain

[@twinkle7273]

Tum pilot ho kya

[@shomusbiologyofficial]

Haan

[@AMBROSIJOSEPH-qc7xo]

So how ventral can be distinguished dorsal

[@vediosoffline5083]

Boring