Human Fertilization | Zygote | Blastocyst | Embryology
HTML-код
- Опубликовано: 22 июл 2024
- #HumanFertilization #Fertilisation #Zygote #embryology
Human Fertilization | Zygote | Blastocyst | Embryology
Like this video?
Sign up now on our website at www.DrNajeebLectures.com to access 800+ Exclusive videos on Basic Medical Sciences & Clinical Medicine. These are premium videos (NOT FROM RUclips). All these videos come with English subtitles & download options. Sign up now! Get Lifetime Access for a one-time payment of $45 ONLY!
Sign up now on our website at members.drnajeeblectures.com/
---------------------------------------------------------------------------------------------------------------------------
Why sign up for premium membership? Here's why!
Membership Features for premium website members.
1. More than 800+ Medical Lectures.
2. Basic Medical Sciences & Clinical Medicine.
3. Mobile-friendly interface with android and iOS apps.
4. English subtitles and new videos every week.
5. Download option for offline video playback.
6. Fanatic customer support and that's 24/7.
7. Fast video playback option to learn faster.
8. Trusted by over 2M+ students in 190 countries.
---------------------------------------------------------------------------------------------------------------------------
▬▬▬▬▬▬▬▬▬▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬
Fertilisation or fertilization, also known as generative fertilisation, syngamy and impregnation, is the fusion of gametes to give rise to a new individual organism or offspring and initiate its development. Processes such as insemination or pollination which happen before the fusion of gametes are also sometimes informally called fertilization. The cycle of fertilisation and development of new individuals is called sexual reproduction. During double fertilisation in angiosperms the haploid male gamete combines with two haploid polar nuclei to form a triploid primary endosperm nucleus by the process of vegetative fertilisation.
In vitro fertilization (IVF) is a process by which egg cells are fertilized by sperm outside the womb, in vitro.
After the sperm enters the cytoplasm of the oocyte (also called ovocyte), the tail and the outer coating of the sperm disintegrate and the cortical reaction takes place, preventing other sperm from fertilizing the same egg. The oocyte now undergoes its second meiotic division producing the haploid ovum and releasing a polar body. The sperm nucleus then fuses with the ovum, enabling fusion of their genetic material.
When the sperm enters the vitelline space, receptors on the sperm head called Izumo1 bind to Juno on the oocyte membrane. Once it’s bound, 2 blocks to polyspermy then occur. After approximately 40 minutes, the other Juno receptors on the oocyte are lost from the membrane, causing it to no longer be fusogenic. Additionally, the cortical reaction will happen which is caused by ovastacin binding and cleaving ZP2 receptors on the zona pellucida. These two blocks of polyspermy are what prevent the zygote from having too much DNA.
Human Fertilization - Zygote - Blastocyte - Embryology
(0:00-6:58)
Defining Fertilization; Zygote & Embryo.
Fallopian Tube/Uterine Tube anatomy; seat of fertilization.
(7:00-15:12)
Transportation of Ovum & Sperm; in detail.
Role of Luteinizing Hormone(LH) & Follicle Stimulating Hormone(FSH).
Corona Radiata & role of Fimbriae in transport of Ovum into Fallopian Tube.
Differentiating b/w Primary, Secondary & Definitive Ovum; fate of Secondary Ovum in absence of fertilization.
(15:13-24:03)
Slow movement of sperm through vagina; Semen & Ejaculate.
Role of Vesiculase enzyme; vaginal environment & sperm motility.
Energy source for sperm's movement.
(24:05-31:44)
Fast movement of sperm through the cervix & rest of the Fallopian Tube;
Role of Prostaglandins, chemo attractants & cilia of fallopian tube.
(31:46-37:08)
Importance of Capacitation Reaction for the motility & later fertilization of the sperm inside the Fallopian Tube; "Conditioning" of the sperm inside the female reproductive tract.
Only Capacitated sperms are able to cross Corona Radiata.
(37:10-50:20)
Explanation of Acrosomal Reaction; fusion of sperm with oocyte.
Cortical reaction in the ovum leading to Zona reaction; inactivation of specie-specific receptor & impermeability to any remaining sperms.
(50:21-57:52)
Fusion of genetic materials; ovum undergoing 2nd meiotic division; Formation of Definitive Ovum.
(57:54-1:00:06)
Recap:
1-Cortical & Zona reaction.
2-Completion of 2nd meiotic division; formation of definitive ovum.
3-Metabolic activation of Ovum; fate of fertilized & unfertilized ovum.
---------------------------------------------------------------------------------------------------------------------------
Join this channel to get access to the perks:
Sign up now on our website at members.drnajeeblectures.com/
Follow us on Facebook:- / drnajeeb
Follow us on Instagram:- / drnajeeblectures
Am a final year medical student ( MBChB) from Africa, Zambia. Throughout my entire medical journey, if l cant watch a recording on any topic from you Doctor, then l cant fully understand that topic. You are simply a Blessing to millions of medical students out there. May God continue to bless you.
E we are 33e re 3e
Yeah
Im also in Zambia lol ...
🇿🇲 Zambia
Zambia 🇿🇲 KUCHALO..... we're also following your footsteps boss
I'm watching you all the way from Ghana- West Africa. You made learning so easy. You're a legend. Thanks sir
Thank you so much for the legendary compliment! ❤️
Eei Akosua nie🤓
Am watching from Sierra leone 🇸🇱
I feel happy when I type a topic and I see Dr Najeeb has covered the topic...thank you sir😭😭
As a medical student from Zambia, in your videos we trust!!! 😊😊
How do i thank this great man.... I have no words.. Just pray for you to live a very long and healthy life sir❤️
Even I am a microbiologist but addicted of your channel 😂 may god keep you happy and bless your family.
I am not a medical student but your classes are easy to learn sir.. First I searched through youtube about the placenta formation & found your video. You are amazing sir.
Previously I searched by the name of the topic which I need to understand but after finding you I always search by the name of the topic by Dr.Najeeb Sir. Thank you so much sir for making every topic cleared. 🙏 Take my regards
Out of all his sessions this has to be the most active class where even students are involved very well 😂
I'm a class 12th student, basically a NEET aspirant..sir your lectures are very informative and helpful..These helps me to prepare for my competitive examination..🙏🙏
Are you in college now?
I am from India doing medical and Dr. Najeeb was really fun to learn with....
Which state?
Sir can I get yr cell no.
Shabana I proud of you
sir , I'm a medical student and my obgyn classes just started and the basics we had to learn ourselves. I wanted to recap fertilization and gametogenesis and reading the books was just getting me confused more and more and I had so many doubts , I was scrolling mindlessly on youtube an was on the verge of tears, thats when I found ur video and decided to give it a try.
earlier I couldn't even concentrate on long youtube videos but ddamn , I'm talking to you at the 1:13:20 min mark. I'm so happy I came across the video. your jokes about capacitation and the mighty sperm made me laugh and wipe my tears. I finally understood this. thank you so much for this, please never stop making videos if you can... you help many students across the world smile. thank you DOCTOR!!!!
For me, I lack words to describe how much you have helped me through your teachings. I will wait patiently to see this teachings compiled in form of TEXTBOOK 📚. God bless you sir, BENJAMIN from NIGERIA 🇳🇬.
Blessed to have such great students. Stay blessed 💖
Greatest teacher ever born on this planet
Sir I am nursing student ....sir the way taught are best....u r world's best....thanku sir
That’s so nice of you. Students like you keep me going. More power to you. ❤️🔥
Dear Sir ,I am a nurse by profession .Thanks a lot for clearing all my doubts .
Ever best lecture from awesome professor ..i am watching lectures again for my fcps part ist
Sir you're my ideal ,, your teaching method is incredible ,, thank you sir for teaching us , your student Anamika ..
Oh my god u r such a great teacher now I'm started to follow ur lecture this is my second time visiting to your lecture but the way u teaches us is brilliant great fan of ur teaching tq do much sir for guiding us I wish Allah grant u more energy love and healthy life your great fan. I wish u reply me.thank u sir❤️
Assalam walaikum sir, i am sk sahil, bsc nursing 4th year student from india .Your all lectures are help me in my profession .jajak allahu khair .allah bless you 🤲🏼🤲🏼🤲🏼
its my 1st year in medicine and i am so lucky to found your videos.... its making me very easy to learn the concepts.... thanks to you SIR u r a saviour.....
Thank sir
Thanks
Dr najeeb you the best teacher in world, thanks so much sir, God bless you and your family sir.
Your videos are really helping sir..u r making topics much much easier and also remembering.. Thank yu so much sir.. expecting more and more videos from you
Sir with huge respect.. You made my life easy. What a lecture, I enjoyed through out the class. Most importantly I learned lot of things. Thank you sooo much🙏🙏
From India.
You are most welcome❤️
@@DoctorNajeeb sir thank you .u are really a good teacher 🙂.which subject u are specialized in (md/ms)sir?
Dear dr. Najeeb, your enthusiasm makes the human heart smile🙏💗. Best wishes from Finland ❄☃️ . Thank YOU❣
Appreciate that a lot. 💖
the best teacher for MBBS....❤❤
Thank you❤❤
When i watch u lecture then i go to classess there i ask many questions from teachers and the concept is always cleared there is no words to praise u.
Glad you appreciated my hard work. Stay blessed 💖
Watching from Nigeria
You're the light of medical and clinical medicine
Glad to hear that. Keep supporting ❤️
I spent 1:13:37 minutes of time is very Amazon and fabulous time tq so much najeeb sir😍😍
Subhanallah. I am always amazed by the creation of Allah by learning the mechanism of these processes. May he bless you
I am amazed with your way of teaching .You make teaching and learning process so much fun. I watch your videos not only to pass exams, but to sound confident with patients. It is very important . I am doing NP and wish I had known this early even earlier. I will share your videos to all my friends who are doing MD or NP. l forward your movies to all of my friends pursuing MD or NP degrees. I am extremely grateful of your generosity in sharing these videos for people like us .
Thanks for your appreciation and support.
Sir your way of teaching is outclass
U are doing great job .may Allah bless you long life with health ❤️
Thank you for your kind words❤️ Keep supporting ❤️
You r my real hero made each and every concept crystal clear
Thank you for your love and support.
Iam a civil engineering student but I love watching your videos in my free time
Thank you for your love and support ❤
Awesome now I have cleared all my doubts about the topic😀 thankyou for that sir
I am fsc 2nd year student wow wow you cleared my concept thankss sir
Everytime when I searched a lecture for on any particular topic, 1st I searched your video on that particular topic
You're just amazing. Thanks to Almighty Allah he blessed us with such a legendary teacher ☺️.
Thank you for your love and support.
May you be blessed with knowledge, prosperity, love, and happiness, always.❤️❤️
Dr Najeeb, you are my hero ❤️ I was a very bad student in my medical college, but I started listening to your lectures. Now I'm done with all the USMLE exams and I have made a channel for guidance for medical students, all over the world.
Thank you for your love and support. ❤ May you be blessed with the knowledge prosperity and happiness always. Keep supporting. ☺️
Sir,, you're the one.... I wanna say,, you're gift of God to us.... And happy birthday in advance sir thank you for coming in this world.. I wish you'll reply me..
Thanks dear ❤️❤️❤️
Dr.najeeb is a ever best teacher
I'm a nursing student and im watching ur lectures since four years .your videos teach me a lot . Im very thankful to God and at the same time u for giving me a strength to do best .......May God give u more and more success ....ameen
Thank u sooooo much for every word i learnt from u .....💫
Legend
Jazakallah Khairan! ❤️😊
@@DoctorNajeeb oh my God!. And this really has made my day sir ......💫
Dr Najeeb is a real genious
my allah blessing you long life with health❤
Thank you for all the love and support❤️ Stay blessed ❤️
Sir, I am from Bangladesh!!! I wanna say one thing that it really helps me😃
Sir i have no words how to express my words that how much i likes you.
Even every medical students likes you and love you🥰🥰🥰❤❤❤
Thank you so much for all the love and support. Stay blessed❤️
@@DoctorNajeeb always welcom ❤❤❤❤
thank you so much for this amazing video!
I love this man, so funny, makes learning so much fun and interesting. Such a great teacher. I have learnt much. Thanks Dr 💞💞
Glad you enjoyed it!
@@DoctorNajeeb hu
Oml thankyou so much Sir ! You are Great I have really understood everything like literally It's so Good MashaAllah may Allah succeed you more ❤️
I'm in class 12th...and i understood everything....thank u sir
Same🖤
Samee🌿🌿
Yes I am also
Yes, me too👍
Me too❤️
namaste sir 🙏🙏🙏 badia lecture tha . very conceptual . aab koi doubt nahi😇😇😇
U r the most amazing doctor that i have ever seen..
Glad to hear that❤️ Keep supporting ❤️
sir your lectures are so helpful and well explained....how much i say it will be short to describe your exceptional way of teaching...THANKS SIR
Glad to hear that❤️ Keep supporting❤️
Your lecture are proving saviour for me🖤.
Sir I have ever seen this type of teaching... great explanation sir...u r the world's finest lecturer...sir...
Thank you for your love and support. :) May you be blessed with knowledge, prosperity, love and happiness, always. We wish you success and happiness in every walk of life and good luck in your future endeavors. Regards, Dr. Najeeb Team
@@DoctorNajeeb thank you sir
great teacher i ever seen 🙏tq so much sir for making these excellent video 🙏 thanks a lot 🙏🙏🙏
Having a test tommow so lucky I get to watch this thank you very much sir🙏
Kindly visit our video library and view all the available lectures using the link below members.drnajeeblectures.com/#!/video-library
Top doctor. Top professor. 👍👍
Allah kamyab kry apko sir g❤❤❤ blessing truly
Thank you for your kind words❤️ Stay blessed ❤️
The lesson that I learnt from this video is to become a gold medalist 🏅
God of medical.thank you so much our God of Medical.
*sir it was the best video I had ever seen thanks sir* 🙏🙏🤗
Sir Maine aapke kai lecture padhe hai aap aisa padhate hai ki koi bhi smjh jaye
You crystal clear concept 💛💛💛🤩🤩
41:29 he spoke Urdu 😅
Btw best teacher ❤ most useful 1:13:17 of my life
Your videos a boon to medicos sir thank you 🌛
Who is the editor of this.
Whoever it is he/she is doing a good job
Glad to know that. 👍 Keep sharing your feedback. ❤️
Watching from your homeland 🇵🇰thank you so much you make my embryology so easy .. ❤️❤️❤️
My pleasure 😊 Happy learning ❤️
superb explanation great approch keep it up
You make me understand the concept. Thank you Doctor
You are welcome❤ Stay blessed ❤
Wow fabulous sir
i am mbbs student in india
I want to become a new dr najeeb
Huge respect 🙏🏻
You are the best sir.......
Doctor your lecture is also useful for my NEET preparation.
Thank u doctor sahab..
You are welcome dear❤️ Keep supporting ❤️
Thank u so much Dr. Najeeb, u made it very easy 🙏
Thanks for liking. Stay blessed ❤️
Igot great help. Thank you Sir
thankyou so much sir for making this complicated topic easy for us.May Allah give you all the happines you want.💖❤❤❤💖💖💖
Ameen. Thank you for supporting
Sir it's a humble request that u will attach the notes PDF with video sir i want this lecture's pdf
Sir i am from pakitan.i am watching your lecture v.amazing way to convey complicated lecture into easy
Glad to hear that❤️Keep watching stay blessed ❤
Sure sir 😊 Ameen
You are not only a great teacher you are always a Dr.......
Thank you sir...
Ma sirf app k he lacture dakhta hu.....
A man created for medicine
I m watching uh from India
Thank you for your love and support! Stay tuned. ❤️
Thanks sir ....I am enjoying your lectures from Pakistan
You are welcome❤️ Keep supporting❤️
How an amazing teacher you're sir. May Allah Keep you happy an blessedd Aamen.wish i had taken these lectures at Start of the med term wouldn't have suffered now.🤧🤧🤧❤️❤️❤️❤️🇵🇰
Nice you from which clg
Sir as I have said this many times no one can teach like u .U r outstanding ❤️
Thanks a ton Keep supporting.❤️❤️❤️
awesome professor keep up
I like your way of teaching.
Me too
Exquisite !! What a class professor!
You are my mentor,
Thank you dr !
What a nice, precise, and I must say an easy lecture. Thanks a lot.
Glad it was helpful! ❤️
Thank you
You should be born again to give lectures for my grandchildren!
thank you sir☺☺
Watching from Kenya,you are the best Sir.
Wow, Thanks! Stay blessed and keep watching❤️
Thank you very much I am watch your videos avry day and become very good in embryology 💞💞💞I am from Sudan 💕💕
Glad you loved it. Stay tuned ❤️
Your lectures are very clear sir....thank you sir....from srilanka
You are most welcome ❤️
A good lecture sir
Sir your video is helpful and supportive medical student
Thank you for your love and support! ❤️
Very impressive. I am impressed. Thank you sir.
Thank you for your appreciation! ❤️.
Thank you Sir
Siiiiirrrrrr............how it feels being the best in your kind
💓💓💓
It feels amazing when students like yourself appreciate hard work! Stay motivated and stay blessed. ❤
Special Respect from Afghanistan you are the real one thank you sir.
Thank you so much for your love and support! ❤️❤️❤️
Thank you so much sir
Really study with fun
I was enjoying when you said all windows closed after entering of one man 😆😆😆
So nice of you. Happy learning ❤❤❤