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Muscles of the eye - extraocular muscles and movements 

Sam Webster
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The muscles that move the eye within the orbit appear straightforward at first sight, but the ways in which they work together to move the eye can lead to confusion. Let's look at the anatomy!
When looking medially, the superior oblique muscle depresses the eyeball/direction of the pupil & the inferior oblique elevates the eyeball. Not what I said at the end of the video. The cranial nerves of the extraocular muscles will describe this more slowly & clearly. I hope.
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30 апр 2018

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Комментарии : 174   
@AkingAquila
@AkingAquila 4 года назад
This video is highly underrated! I could not for the life of me understand why the Superior oblique caused depression (and the converse, why the Inferior oblique caused elevation). I had watched several videos (KenHub and AnatomyZone) and they all just stated the actions of the muscles. Dr. Webster here was the only one who took the time to explain the axes of the eye, and how the various muscles crossing those axes result in their primary and secondary eye movements. BTW the answer to my question was that the Superior oblique actually runs anterior to posterior, so when it contracts, it pulls the anterior portion of the eye downwards! Hence the depression. I'm sure I'm not the only one who had that problem haha. Dr. Webster, you've got yourself an extra subscriber! Thanks for the great, hands-on explanation!
@olivia31192
@olivia31192 3 года назад
So so true! Thanks so much Dr Webster!
@AliAhmed-rr6ny
@AliAhmed-rr6ny 3 года назад
exactly what happened with me
@cowsmoon5115
@cowsmoon5115 3 года назад
I totally understand everything as to what you had just said there...
@expectopeetrrronium7349
@expectopeetrrronium7349 2 года назад
still didnot understand why sup oblique cause depression. pls explain
@hiefia8568
@hiefia8568 Год назад
@@expectopeetrrronium7349 muscles have an origin point and an insertion. When they contract, they move the organ they are attached to toward the direction of their origin. The superior oblique muscle moves from the back of the orbit( posteriorly) along the side( medially) until it gets to the trochlea where it switches direction from medially to laterally. From here it moves from front to back( anterior to position). The ability of the superior oblique to depress the eye occurs when the eye is moved medially. I think this eliminates the contribution of the medial to lateral angulation of the muscle. Hence your eye is stuck with only the influence of the anterior to posterior angulation. And since the muscle will pull towards the origin and since the anterior has become the "origin" in a sense, your eye will move from back to front. But remember that the eye is now adducted ( medial ) so your final eye direction will be down toward the side( ie inferomedially).
@valentinemcdermott
@valentinemcdermott 2 года назад
6:50-7:30 deals with the anatomy of the superior oblique and is an excellent explanation of why the SO can cause depression of the eye.
@indianindian7757
@indianindian7757 3 месяца назад
Tysm for this
@jamescartwright387
@jamescartwright387 3 года назад
I've lived for 25 years without knowing that my eyes rotate...mind blown
@ShreyaRajgopal
@ShreyaRajgopal 5 лет назад
Amazing clarity. Also, you look very much like Dr. House.
@lexihernandez4191
@lexihernandez4191 Год назад
Ive been watching your videos for couple months now, and I just wanted to say your passion for anatomy is inspiring. Thank you, for teaching and possibly never even being able to see the fruits from which the seeds you have planted.
@mcmoodoo
@mcmoodoo 2 года назад
Incredible clarity! Super comprehensive! 24 minutes of pure ocular value!
@andreiacastanheiradasilva8287
@andreiacastanheiradasilva8287 5 лет назад
While it's easy to just memorize the actions, it's hard to really understand it deeply - thank you so much for not being concise and really care to explain the logic behind it all! 👏 Your video was, amongst all the other videos I've watched and all the descriptions I've read in textbooks, what helped me most! I'm sure your channel will be accompanying me through the rest of med' school 🤗🙏
@rohangandhi28
@rohangandhi28 5 лет назад
You are amazing man, I mean I was struggling to understand the “complex” movements of SR, IR, and SO,IO. Thanks for explaining!!
@prithvirajbanerjee1547
@prithvirajbanerjee1547 3 года назад
Whenever I'm stuck with some anatomical problem, I know there's one man I can look up to for solution, and that is Dr Sam Webster. You truly are a great teacher sir. Thank you very very much for posting these gems.
@souviksikdar3180
@souviksikdar3180 3 года назад
Tomar pod marboh
@s.a5590
@s.a5590 4 года назад
I am so bored for lockdown so I here just to learn something new haha
@kathmandunepal9547
@kathmandunepal9547 4 года назад
OH MY GOD! Its been 5 YEARS!! Since 5 years i was soooo confused about how superior oblique could cause the eye to look down when it lies upward! I checked for videos back in 2014, didn't find any! Finally you've made that point super clear!
@gopalreddy7582
@gopalreddy7582 Год назад
I still didn’t get it can u explain me pls
@ruby-pm8zw
@ruby-pm8zw 4 года назад
first of all- beautiful eyes, secondly thank you I will be spending NYE with you- so happy New year to you and to every student on this platform
@user-fg7px8jp5c
@user-fg7px8jp5c 3 года назад
Thank you very much for this video! I had so much doubt studying the extraocular muscles movements, and was at the same time wondering why everything goes in the opposite direction in the H test! I agree with you that these take a bit studying, but it’s now much more better after your explanation. Thanks again!!
@nataliebray
@nataliebray 4 года назад
This video helped me understand the extrinsic eye muscles for my anatomy practical exam. Thank you so much!
@Mariam_oluwaseyi_
@Mariam_oluwaseyi_ 3 года назад
Finally! Whew. Your explanation is so explicit I'm so grateful
@nsglaasakr8217
@nsglaasakr8217 4 года назад
I have been searching for a compelling explanation for the written actions of the extra ocular muscles and u r the best....ty so much
@danielpa8644
@danielpa8644 2 года назад
Excellent lecture, especially the part where the bony cavity AP axis that holds the eyeball and muscles is actually laterally deviated. So when pupils appear to be in the center of the eyeball the pupils are actually medial to the bony AP axis. This is why the eye muscles cannot work in isolation. Because the muscles are attached past the vertical and horizontal equators the eyeball, contractions of the eye muscle cause the eyeball to move along multiple planes. This is why the inferior oblique muscle pulls the eyeball up and out. The name of the muscle is just its location not its function. How this was engineered is incredible.
@irenacastle5482
@irenacastle5482 3 года назад
Best explanation I have found. Not even expensive anatomy books touch on this.
@ruthdominguez1542
@ruthdominguez1542 4 года назад
Watching your videos helps me understand the concepts. Thank you!!!
@palashbinayake6904
@palashbinayake6904 2 года назад
Thank you sir, this video made it easy to visualise and imagine how those muscles work , excellent job.
@toniencheff4046
@toniencheff4046 3 года назад
Happy New Year, Sam to you and your family. I hope you all had a great Christmas. I saw the video with you getting the Christmas tree with your wife. I am very grateful for your excellent videos. Thank you from the bottom of my heart.
@sriparnaacharya2696
@sriparnaacharya2696 4 года назад
This is the best video on movements of eye ball.. Thank you so much sir...
@juliethomas8401
@juliethomas8401 5 лет назад
Beautifully explained !!
@yixuan_yx
@yixuan_yx 4 года назад
Great explanation. Thank you so much!
@user-zu8lq8qe2y
@user-zu8lq8qe2y 4 года назад
You've made this so interesting. Thank you!
@qudsiashakeel7920
@qudsiashakeel7920 4 года назад
THIS WAS AWESOMEEEE!! thank you Dr.Webster
@hebaelnabawy8871
@hebaelnabawy8871 3 года назад
I have watched several videos and didn't want to watch this since it's longer but seriously this is the best and I've wasted more time by watching the other videos wish I've watched this earlier. Thank you wish you all the best doctor :D
@rbg7408
@rbg7408 3 года назад
When fun and wisdom goes together... thank you sir!
@muskangaba4341
@muskangaba4341 2 года назад
Thank you for giving everyone an access to quality medical education ❤️
@pc_opinions
@pc_opinions 3 года назад
An excellent video on eye movements. Great job!
@gavinpersaud4243
@gavinpersaud4243 5 лет назад
excellent video and good commentary. Thanks mate
@amanagarwal2746
@amanagarwal2746 5 лет назад
Superbbb... Sir And the thing you said at the end was just amazing
@amulcool7229
@amulcool7229 2 года назад
Thank u so much sir❤️❤️❤️.... Literally searched every other video but never understood the secondary and tertiary actions of oblique muscle...
@puneetkantiwal8097
@puneetkantiwal8097 5 лет назад
Awesome video man! U cleared all my doubt, great job! Thanks a lot
@MustafaAli-ug3qw
@MustafaAli-ug3qw Год назад
Brilliant, thank you so much.
@kalpanayadav2836
@kalpanayadav2836 3 года назад
Thank you for making it easier to understand 😊
@IldaBegic-wz8oe
@IldaBegic-wz8oe 9 месяцев назад
Thank you so much! I`ve been looking for this kind of explanation forever. You saved me 🥰
@zeelpatel8049
@zeelpatel8049 6 лет назад
Very well explained.Thanks.
@PatDotto
@PatDotto 2 года назад
Amazing explanation!! Tks ❤️
@gaynorankamah7381
@gaynorankamah7381 3 года назад
Great video, thank you.
@shavisingh6393
@shavisingh6393 5 лет назад
Thank u soo much sir for interesting demo nd stressing ur eye . Great work
@szehonyu7325
@szehonyu7325 5 лет назад
That's so useful! Thanks man!
@elchin571
@elchin571 4 года назад
thank You for great explanation!
@hilal5159
@hilal5159 3 года назад
omg what a perfect teacher, cause of the pandemy I'cant go to university and can't do our lab lessons conclusion of it I can't picture these anatomic structure in my head but this video helps so much. thanks a lot
@clarisalolita4783
@clarisalolita4783 5 лет назад
Thank youuu for the great explanation
@debarghapati8917
@debarghapati8917 2 года назад
I have no words to thank you.
@watermelonsugar_1535
@watermelonsugar_1535 2 года назад
Thankyou so much, my confusion about intorsion and extorsion is resolved. 😊
@user-ke9jl9uy1q
@user-ke9jl9uy1q 3 года назад
Excellent explanation, Dr.! I've become your humble subscriber😊 Thank you!!!
@mariashieladolosa8239
@mariashieladolosa8239 Год назад
I need to watch this video. Thanks to you Sir. I like your accent, it's very nice to hear.
@rajatsingh24k
@rajatsingh24k 3 года назад
The insertion points and the fact that the axis of the eyeball in the normal physiological setting (baseline) is different from the axis of the orbit are key. Watched 4 other videos before this one and they were all sh**. This video is the only one so far that made this concept clear. What an amazing teacher. Med schools should just show Dr. Webster's videos for anatomy and save everyone a ton of time!
@omarisam3650
@omarisam3650 3 года назад
excellent video!! thank you
@VMGChannel
@VMGChannel 4 года назад
Really helpful. Thanks
@h0m0.sapien
@h0m0.sapien 4 года назад
Simply amazing!!
@clearwavepro100
@clearwavepro100 Год назад
Wonderful thank you!
@DrCarlosAndresGarcia
@DrCarlosAndresGarcia 5 лет назад
This is the best video i’ve seen of the movements of the eye🎯. I’ll upload mine version in spanish this weekend!
@lyndawson7567
@lyndawson7567 4 года назад
good stuff
@user-mr7or4yj1i
@user-mr7or4yj1i Год назад
Amazing tutorial
@mzml4696
@mzml4696 5 лет назад
Even a non anatomist like me can make sense out of it. Nice and interesting Sam . :)
@kikibear12146
@kikibear12146 Год назад
Well done video!!!
@Soaresbrook
@Soaresbrook 5 лет назад
Excellent video, man. i could be sure i've got trochlear palsy after your explanation of eye rotation, It keeps the horizon in the healthy eye, but it doesn't in affected eye.
@medicine4094
@medicine4094 3 года назад
i really ask god to bless u every day
@YH-nr7my
@YH-nr7my 4 года назад
thank you so much! it was the most helpful video :)
@dranandvarunachari
@dranandvarunachari 5 лет назад
He is amazing ❤❤
@fatimakhalid1991
@fatimakhalid1991 2 года назад
Amazing!
@ramahmardini222
@ramahmardini222 4 года назад
the best anatomist evvver
@countto5591
@countto5591 4 года назад
Very helpfull...man..really thank you
@Jomanaagh
@Jomanaagh 5 лет назад
you are amazing , thank you very much .
@albaqary91
@albaqary91 5 лет назад
great effort , thanks
@mlemay2486
@mlemay2486 6 лет назад
Other than the excellent explanations.. you make me laugh! I love your humour :)
@tommybryant4985
@tommybryant4985 Год назад
Wonderfully informative 🫶
@duocphamtruongtho4462
@duocphamtruongtho4462 2 года назад
Thanks very much!
@missunknownps3
@missunknownps3 3 года назад
Superior oblique causes intorsion Inferior oblique causes extorsion When they work together they cause Abduction Superior oblique pulls eye down Inferior oblique pulls eye up THANK YOU FOR EXPLAINING THIS IVE BEEN LOOKING FOR A GOOD EXPLANATION!
@aydaradfar9676
@aydaradfar9676 4 года назад
Thank You !!!
@priyankarane6554
@priyankarane6554 5 лет назад
Just love you for this one 😊🤗 I like that color of your eyes.. Seriously 😍😘
@rahavpokhrel8748
@rahavpokhrel8748 5 лет назад
Awesome!
@kishorekumarbangi512
@kishorekumarbangi512 2 года назад
Nice job.
@saddikhaddad1586
@saddikhaddad1586 3 года назад
Thank you Sir!
@gladysmartinez238
@gladysmartinez238 4 года назад
Thank you!!!
@rezarezanaghibi
@rezarezanaghibi Год назад
Wow terribly informative 😮
@Knucklesdeadlypunch
@Knucklesdeadlypunch 2 года назад
Thank you so much Dr. For sharing your knowledge now I have a better understanding of eye movement and I can finally help my anxiety bc I have a better understanding. Again thank you. Be blessed 🙏🏾🙏🏾
@rafiatajani1712
@rafiatajani1712 9 месяцев назад
How would it cure your anxiety tho
@ngocminh8068
@ngocminh8068 4 года назад
Thank you again
@user-dz8ky8cl8k
@user-dz8ky8cl8k Год назад
U are really amazing!
@igorlimamaldonado725
@igorlimamaldonado725 3 года назад
Excellent.
@kareenabudhrani9261
@kareenabudhrani9261 2 года назад
This is sooooo gud ... SO was irritating me and I got it now.
@lenaatyat5186
@lenaatyat5186 Год назад
You’re the best ❤❤❤
@Chrysolite-kn3mz
@Chrysolite-kn3mz 3 года назад
Thank you so much Dr Webster; you explained all so well, especially the reasons behind the actions of each muscle, which all kind of depend upon the axis they lie upon.. as I was watching your video, I came to a realization how unique and amazing God's creation are.. thank you.
@keertidpai7939
@keertidpai7939 Год назад
Thank you sooooooooooooooooooo much
@Saidoromo2024
@Saidoromo2024 3 года назад
Informative 👊
@jibansharma4227
@jibansharma4227 5 лет назад
It was damn impressive. made it so easier to understand. big thanks Sam. Best in the internet for extraocular muscles.
@jenniferzhou4264
@jenniferzhou4264 3 года назад
very usefully thank you
@shorouksalem5371
@shorouksalem5371 4 года назад
More than wonderful
@rafal3941
@rafal3941 Год назад
Thank youuuu really I mean it you’re pretty good ❤ الله يوفقك
@muhamedfaour4629
@muhamedfaour4629 6 лет назад
Thank you, love your lectures.
@anfaljaryan4268
@anfaljaryan4268 3 года назад
you are amazing
@stevensouter6169
@stevensouter6169 Год назад
Hi Sam. Great Video: Question: Is it more straining to look up or look down? Why is this the case?
@dr.zaynab4450
@dr.zaynab4450 6 лет назад
Ilove u llove lesson to your lecture ..really thanx to you ♥
@shwanmussa674
@shwanmussa674 6 лет назад
Dr. zaynab Hello Miss Zaynab from where you are ?
@sibunal7410
@sibunal7410 Год назад
Why so good 😭
5 лет назад
You are great.
@sumitkumarsah5161
@sumitkumarsah5161 3 года назад
🔥🔥 Love from Nepal
@cousium
@cousium 5 лет назад
Hey Sam, i'm from france, it's not so easy to listen english (when you don't practice it enough ahaha) but your video is very helpfull and you just clear my mind about this subject ! Hope to see you making more video about eyes. (for my knowledge and my english ahaha)
@SamWebster
@SamWebster 5 лет назад
Thanks - if I tried to do it in French it would be terrible!
@WmTyndale
@WmTyndale 2 года назад
Very nice. I do not believe that science understands how the eye works at the computer level. Stimulation to output, mapped out like the circuits of a computer chip. It is only understood crudely on the basis of Newtonian Optics. I say this because a certain Dr. Bates linked the misuse of these muscles to the development of refractive errors. My feeling is that cramping, spasms and other muscular stresses brought on by long periods of optical duress weakens the organ. Glasses finish the job as does any intervention on the basis of incomplete information. Using these insights many individuals including myself have been able to partially or completely reverse myopia. Muscular Rehabilitation is the key.
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