Anatomy of The Human Eye Ball | Structure & Function | Cornea & Sclera

#drnajeeb #medicines #medicaleducation #pharmacology #humaneye #eyeanatomy

Anatomy of The Human Eye Ball | Structure & Function | Cornea & Sclera

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▬▬▬▬▬▬▬▬▬▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬

00:00:00 Introduction to the structure of eyeball
00:00:57 Detailed explanation on coats/Layers of the eyeball
00:17:39 Purpose of the three coats/layers of the eyeball 17:39
00:18:29 What is Lens, vitreous humour and aqueous humour
00:21:00 Review of the basic structure of the eyeball
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Humans have two eyes, situated on the left and the right of the face. The eyes sit in bony cavities called the orbits, in the skull. There are six extraocular muscles that control eye movements. The front visible part of the eye is made up of the whitish sclera, a colored iris, and the pupil. A thin layer called the conjunctiva sits on top of this. The front part is also called the anterior segment of the eye.
The eye is not shaped like a perfect sphere, rather it is a fused two-piece unit, composed of an anterior (front) segment and the posterior (back) segment. The anterior segment is made up of the cornea, iris, and lens. The cornea is transparent and more curved and is linked to the larger posterior segment, composed of the vitreous, retina, choroid, and the outer white shell called the sclera. The cornea is typically about 11.5 mm (0.45 in) in diameter, and 0.5 mm (500 μm) in thickness near its center. The posterior chamber constitutes the remaining five-sixths; its diameter is typically about 24 mm (0.94 in). The cornea and sclera are connected by an area termed the limbus. The iris is the pigmented circular structure concentrically surrounding the center of the eye, the pupil, which appears to be black. The size of the pupil, which controls the amount of light entering the eye, is adjusted by the iris' dilator and sphincter muscles.

Light energy enters the eye through the cornea, through the pupil, and then through the lens. The lens shape is changed for near focus (accommodation) and is controlled by the ciliary muscle. Photons of light falling on the light-sensitive cells of the retina (photoreceptor cones and rods) are converted into electrical signals that are transmitted to the brain by the optic nerve and interpreted as sight and vision.

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[DoctorNajeeb]

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One of the best Teachers in the Field of Medicine....
Taught everything from Basic..Even a 8th grader will understand the lecture..Such a Simple Language...
ThankYou So Much !!! Dr.Najeeb Sir

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Dear Professor Najeeb, You are an excelent teacher. It is so wonderful to see people using their gift. I think you should know you have a legion of fans in (at least) one Portuguese University. Thank you so much! Blessings to you, I hope you have a life full of love, joy and abundance.

[marytgeorge]

I looked for animated videos to teach my 6 yearl old child about the eye but this was the clearest video out there. No animation, no background music but she understood everything! This is teaching at its best. Thank you for posting.

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India needs more such teachers like u sir...ur lectures r very beneficial fr us sir...
Thanku sir...from pulwàma kashmir

[dashachess]

Wow ! This man deserves an applause. Our teacher like every other teacher in anatomy class rushes through the material because its an intensive course... but you don't really learn anything except outside study. I am glad this man took 20 mins of his class to teach what is now to me truly is the basics of the eye (which seemed really difficult for self study until I watched this video). Thank you so much !

[nikitasharma]

I wish there were more teachers who taught like you and bothered to know that we understand.
Great work

[sadiyas]

dear sir, this was the best explanation ever. this is the first time i understood anatomy of eye. thank u very much sir.

[reemasaleh]

you are such a wonderful dr, U make the medicine for us so easy
Bunch of thnx to you Dr Najeeb

[mohamedusman]

I'm amazed on your knowledge in eye anatomy and most importantly you are an awesome teacher who explains the concepts very clearly and detaily :)


Thank you, Dr.

[shakeelahmadjan]

He once came to our university a very noble and down to earth person I ever meet.
for first time I understand this topic.

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Every medical student needs to see your lectures. This may be the future of learning. New teachers should learn from you.

All of the love

from Africa

[ryklin]

great energy and teaching style. Thank you. So insightful. So clear. Great delivery of material. it would be a pleasure for someone to take your classes in real-life. I never though of the iris as a circle, thank you for elucidating. We need to always remember the geometry is spherical, and we are dealing with a unique coordinate space of the inside of a sphere. This influences the geometry of all the structures especially the neural layer. Nice emphasis on what are transducers. very interesting that the pigmented layer continues far forward. Why would you hypothesis the pigmented layer evolved all the way forward to the iris in the mammalian eye? Perhaps it plays multiple roles. I wish you had touched on the ganglionic layer, but that may too advanced for this lecture. Bravo. Very basic structure of eyeball indeed. I'm going to watch your other videos.

[beixixu]

Fantastic lecture! I love how you repeat the terms again and again to help students remember, and engage them in the process. Thanks for your great work, sir!

[fahriyakhan]

dear sir, , , you explained it in such an easy way that i picked everything right at the moment you were explaining it....thank you for explaining it in such an easy way....

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Sir you are a gift from the Almighty to medical
Lots of love and respect sir...

[rashmirana]

Those who disliked the video mst be those teachers who r jealous of this great envy his teaching skills...how someone can dislike his vid.he is the only one who can make someone understand the most difficult topics of medical science

[puddleduck]

Thank you for sharing your knowledge, the best lecture on eye anatomy I've had so far.