Gastrulation | Formation of Germ Layers | Ectoderm, Mesoderm and Endoderm
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- Опубликовано: 28 авг 2024
- 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
***EXCLAIMER: The content (ex. images) used in this lesson are used in accordance with Fair Use laws and are intended for educational/teaching purposes only.***
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.
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.
in 7:05 you can hear that he is saying what youre saying
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
Extremely helpful video. This served as a great foundation to embryology.
Glad it was helpful!
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.
wonderful; you helped explain something my professor tried to explain but I wasn't understanding it; your diagrams and explanation was nice.
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.
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
Excellent explanation. You go very thorough in details. Thank you so much.
JJ Medicine, you are phenomenal.
Thank you for the amazing video! Cheerings from Brazil!
i thought that all germ layers originated from the epiblast cells?
Yup, you are right.
super sir you made this concept so easier .clearly understood this Thank you
Excellent explanation 👍👏🏻
Best video watched till now,❤
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❤❤❤❤
This was really explained so well.
ı want to ask a question. where is the alloenteric diverticulum and what does it do? Thank you so much for that beneficial video.
i hate medschool,im very tired, just wanted to put that out there. great video tho
Don't give up ✨you can do itt
Amazing video!!! Helped me understand a lot for my physiology exam!
great explanation thank you! Very well presented
That was awesome. Amazing visuals and explanation
Amazing video,excellent explanation
thank u its so clear n helpful with summary note first then go into more details alone with images after!
I learned many things out of ur upload thank you so much
Perfect explanation !
thank you for the explanations! i really appreciate this! this helps me a loooot!❤️
that was super helpful to recap embryology, thanks! :D
hi babe.where do u live.
Thank you very much
شكراً جزيلاً 🙏🙏💜
Good video.on 3 germ layers.
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
Your videos really helps to understand that topic. Also makes simple. 💗💗💗💗💗💗💗💗
Loved this video.. Thank you🙏
Great demonstration
Thank you very much
I really understand that ❤❤❤❤❤❤❤
Great explaining 🎉
I have a question / is the primitive streak give informations to the genes to create human embryo and our body ?????
very good explanation and awesome video, thanks a lot for ur efforts👍
Thank you so much brother
Superb explaination 👍
Is the primitive streak create the 3 germ layers 🤔?
Goated vid
فديتك منقذي🥹❤️❤️
Awesome video!
Good video there is incorrect info there. all three germ layers arise from the epiblast
Thank you sir
thank you
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?
Does every organism possess different gastrulation processes?
I have a question is the primitive streak creat the embryo ??
Is the also the formation of germ disc
Thank you
Very informative...
very nice explanation...why don't you make more Embryology videos???
Thanks bro
thanku so much sir
Which germ layer is formed first???
Perfect
Plz anyone tell me from where Endoderm form.....many other videos and Google tell s three layers forms. From epiblast ..
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.❤❤
5:13 gastrulation
You saved my 5 min ☺️🤧
Which of the germ layer is formed by delamination of cells from the inner mass.
Endoderm
Neuralatin where plz?
Good
This video solved me probsssssss
Thnk u
You're very welcome! Glad it helped :)
Why did I get myself into this...
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.
Orign of sperm is mesodermal ..?
damn cool.
skeleetle
sooo much words cant process ahhh
💚 Thanks 💚
Now i understand
Why Westerners
Are extremely slow to getting it.
All these nonsense Greek
Terminalogy...
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
False knowledge
Thank you