Gastrulation | Formation of Germ Layers | Ectoderm, Mesoderm and Endoderm
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- เผยแพร่เมื่อ 19 ก.ค. 2018
- Lesson on Gastrulation and the Formation of the 3 Germ Layers known as the Ectoderm, Mesoderm and Endoderm. Gastrulation is a process whereby a bilaminar disc (comprising the epiblast and hypoblast cells) gets transformed into a trilaminar disc (comprising the germ layers of ectoderm, mesoderm, and endoderm). Gastrulation is responsible for forming the 3 germ layers including the ectoderm, mesoderm and endoderm.
After the egg is fertilized by a sperm, the resulting zygote will eventually develop into a blastocyst, which contains an inner cell mass that will become the embryo. The outer cells on the blastocyst are known as trophoblasts, which differentiate into syncytial trophoblasts and cytotrophoblasts. The syncytial trophoblasts will invade the endometrium of the uterus and implant the blastocyst. The blastocyst will eventually become embedded into the endometrium. The inner cell mass of the blastocyst will differentiate into epiblast and hypoblast cells, forming the bilaminar disc. The process of gastrulation transforms this bilaminar disc into a trilaminar disc comprised of the 3 germ layers.
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JJ
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NOTE: Although I try to be 100% accurate, if you see any mistakes in this video, please let me know and I will make a correction. Thanks so much!
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Although I try my best to present accurate information, there may be mistakes in this video. If you do see any mistakes with information in this lesson, please comment and let me know.
Second! I love these videos they help me so much I’m twelve and I’m gonna be a cardio thoracic surgeon
I am also mbbs
Wow. Good luck. 😘
You will be a very good doctor. I wish i had these videos when i was 12.
Study hard and always stay focused on your dream. As you get older, relationships and things are going to distract you, but please keep this the key focus of your life. I wish I told myself this when I was your age.
Lexi Dube hey i’m in medical school now, and all i can say is to keep up that energy! focus and visualization are key. your goal will be here before you know it. i believe in you.
Endoderm does not entirely form from the hypoblast, it is derived from mesendoderm an intermediate tissue that has the potential to differentiate into mesoderm or endoderm depending on inductive signals it receives.
You can find some hypoblast (visceral endodoerm) cells in the definitive endoderm but most of these cells are derived from the ingress of epiblast cells.
Your explanation and visuals are amazing..now i have cleared about the germ layer formation.. this way surely will make to love embryology... Thank you so much sir
Thank you very much! I got an A+ in embryology in college! Your lessons helped me a lot :)
Hi Marcelo! I'm so happy to hear that :)
hi
Excellent explanation. You go very thorough in details. Thank you so much.
wonderful; you helped explain something my professor tried to explain but I wasn't understanding it; your diagrams and explanation was nice.
Thank you for the amazing video! Cheerings from Brazil!
Extremely helpful video. This served as a great foundation to embryology.
Glad it was helpful!
That was awesome. Amazing visuals and explanation
super sir you made this concept so easier .clearly understood this Thank you
This was really explained so well.
thank you for the explanations! i really appreciate this! this helps me a loooot!❤️
Amazing video!!! Helped me understand a lot for my physiology exam!
JJ Medicine, you are phenomenal.
The blastocyst will leave the zona pellucida, or membrane, of the egg cell before implanting itself inside the uterus. The zona pellucida is a thick, jelly-like layer that surrounds the egg cell and helps to protect it. Once the blastocyst has developed to a certain point, it will hatch out of the zona pellucida and begin the process of implantation in the uterus. The process of implantation involves the gradual penetration of the endometrial lining by the blastocyst, and the establishment of a connection between the blastocyst and the endometrial blood vessels. This connection is essential for the nourishment of the growing embryo.
Great demonstration
thank u its so clear n helpful with summary note first then go into more details alone with images after!
ı want to ask a question. where is the alloenteric diverticulum and what does it do? Thank you so much for that beneficial video.
Loved this video.. Thank you🙏
great explanation thank you! Very well presented
Good video.on 3 germ layers.
Good video, but slightly incorrect. The endoderm is not derived from the hypoblast. Rather, the endoderm is derived from epiblast cells that displace the hypoblast.
Amazing video,excellent explanation
A first year medical student I want lots of things but remember that the most important thing is to be successful every thing else comes an goes❤❤❤❤
very good explanation and awesome video, thanks a lot for ur efforts👍
Thank you very much
شكراً جزيلاً 🙏🙏💜
Perfect explanation !
I learned many things out of ur upload thank you so much
Your videos really helps to understand that topic. Also makes simple. 💗💗💗💗💗💗💗💗
Very informative...
that was super helpful to recap embryology, thanks! :D
hi babe.where do u live.
i thought that all germ layers originated from the epiblast cells?
Yup, you are right.
Superb explaination 👍
i hate medschool,im very tired, just wanted to put that out there. great video tho
Don't give up ✨you can do itt
very nice explanation...why don't you make more Embryology videos???
Great explaining 🎉
Awesome video!
Good video there is incorrect info there. all three germ layers arise from the epiblast
Thank you very much
I really understand that ❤❤❤❤❤❤❤
Thank you so much brother
Hi,wanted to ask if epiblast and hypoclast are actually present inside blastocyst.can I say blastocyst converts into epiblast and hypoblast which eventually gets converted into epiderm,mesoderm and endoderm?
Thank you
I have a question / is the primitive streak give informations to the genes to create human embryo and our body ?????
thanku so much sir
Thank you sir
I am a medical student but l am afraid of failure in this faculty every thing is difficult what should l do please 😭😭😭😭
Hager Mohamed hello hope you are fine ,I suggest you to go through textbook if you’re 1st or 2nd yr or you can opt some online platform according to your need or live sessions like satellite classes too will be helpful.
From which university ??
Pray to God for help
Is the primitive streak create the 3 germ layers 🤔?
Does every organism possess different gastrulation processes?
Thanks bro
thank you
I have a question is the primitive streak creat the embryo ??
Which germ layer is formed first???
Plz anyone tell me from where Endoderm form.....many other videos and Google tell s three layers forms. From epiblast ..
Perfect
فديتك منقذي🥹❤️❤️
Is the also the formation of germ disc
Goated vid
This video solved me probsssssss
Thnk u
You're very welcome! Glad it helped :)
Good
Which of the germ layer is formed by delamination of cells from the inner mass.
Endoderm
damn cool.
Spoken to the 12-year-old future physician:
You are rare but perhaps always always remember this: you may and should question all things, through both heart and mind. You are not an unnatural hospital system of rules and regulations. You are a natural person like every other natural being on our living mother planet, be them homeless, rich, poor, handicapped, ignorant, loving, spiteful, or poor. If you go down your honorable path, never ever forget this:
Do to an other what you'd have done to yourself. Listen, however doubtful or tired you may be. Listen and think as if you yourself are your patient. And for fun, ask why a patient has been called "patient" while doctors practice on each.❤❤
Neuralatin where plz?
Why did I get myself into this...
5:13 gastrulation
You saved my 5 min ☺️🤧
Orign of sperm is mesodermal ..?
just remind me and ya'll wherever you see "blast" with a word in biology it probably means "pre-mature"
Kindly correct your explanation. All the germ layers are formed by Epiblast only. Hypoblast doesn’t contribute to the formation of endoderm.
skeleetle
sooo much words cant process ahhh
False knowledge
In the Holy Quran, God speaks about the stages of man’s embryonic development:
We created man from an extract of clay. Then We made him as a drop in a place of settlement, firmly fixed. Then We made the drop into an alaqah (leech, suspended thing, and blood clot), then We made the alaqah into a mudghah (chewed substance)... 1 (Quran, 23:12-14)
Literally, the Arabic word alaqah has three meanings: (1) leech, (2) suspended thing, and (3) blood clot.
In comparing a leech to an embryo in the alaqah stage, we find similarity between the two2 as we can see in figure 1. Also, the embryo at this stage obtains nourishment from the blood of the mother, similar to the leech, which feeds on the blood of others.3
The second meaning of the word alaqah is “suspended thing.” This is what we can see in figures 2 and 3, the suspension of the embryo, during the alaqah stage, in the womb of the mother.
The third meaning of the word alaqah is “blood clot.” We find that the external appearance of the embryo and its sacs during the alaqah stage is similar to that of a blood clot. This is due to the presence of relatively large amounts of blood present in the embryo during this stage4 (see figure 4). Also during this stage, the blood in the embryo does not circulate until the end of the third week.5 Thus, the embryo at this stage is like a clot of blood.
So the three meanings of the word alaqah correspond accurately to the descriptions of the embryo at the alaqah stage.
The next stage mentioned in the verse is the mudghah stage. The Arabic word mudghah means “chewed substance.” If one were to take a piece of gum and chew it in his or her mouth and then compare it with an embryo at the mudghah stage, we would conclude that the embryo at the mudghah stage acquires the appearance of a chewed substance. This is because of the somites at the back of the embryo that “somewhat resemble teethmarks in a chewed substance.
You can see all the pictures compared to to original text if you google it.
Highly watch professor Keith Moore.
Please if your interested more watch
Keith Leon Moore was a professor in the division of anatomy, he explains everything in details
Thank you