Finally! After surfing for few days through youtube, I found a video that gave the best explanation how that 23 degree axis' differences did their job. Thank you very much!
Dear NotedAnatomist thank you for the video but could you please explain further the part where you said the axis of the orbit and that of the eyeball are not the same. Thank you
I'm a bit confused with the clinical testing diagram. how come in the clinical, when u do the H and make the eye look up and in, its labeled the IO instead of the SR. doesn't the SR make you look up and in? it makes sense if that was a representation of the Left eye...is that a mistake?
+Tam Nguyen Hi Tam, this is a confusing element for many medical students. Watch this other tutorial i have about clinically testing eye muscles/nerves ... does this help? ua-cam.com/video/3J2UZiLVZKA/v-deo.html
+Tam Nguyen The challenge here is knowing the difference between the "anatomical" action an eye muscle produces (i.e., the SR moves the eye up and in) versus the "clinical" movement used to test the eye muscle (i.e., you clinically test the SR by abducting then elevating the eye). With the MR and LR muscles it is easy because the MR is the only one muscle that adducts and the LR is the only muscle that abducts the eye in the horizontal plane. Therefore, the "anatomical" actions and "clinical" movements of the MR and LR are the same. However, when elevating the eye (moving the eye up in the vertical axis) there are two muscles working together (SR moves the eye up and in and IO moves the eye up and out). Therefore, in order to test one muscle (SR) it must be isolated from the other muscle (IO). This is accomplished by moving the eye in such a way as to take away the biomechanical advantage of one muscle in the vertical plane. When an eye is abducted (looking laterally to the wall) this movement removes the biomechanical advantage of the IO from looking up (the movement produced by the IO on an abducted eye is extorsion not elevation). As such, the only eye muscle able to elevate an abducted eye is the SR. Does this help? Here is a link to a website that is very helpful for testing these concepts: cim.ucdmc.ucdavis.edu/eyes/version15/eyesim.html
By far the best video on extraoccular muscles I have come across on the web. Thank you.
Thanks Krishna ... Glad it was helpful.
Thanks for explaining in under 7 mins what my lecturer couldn't in two hours!
the best video about extra ocular muscles ever
The best presentation on UA-cam i ever seen on extraocular muscles.!♥️
Finally! After surfing for few days through youtube, I found a video that gave the best explanation how that 23 degree axis' differences did their job. Thank you very much!
My pleasure ... i am happy that the tutorial was helpful.
After five years in medical school I now finally understand how the extraocular muscles work.
The best video on youtube about extraoccular muscles I have ever watched ,Thank you👏🏻👏🏻🙌🏻
King of anatomy !!!!!!
Thank you so much sir…..really u made it so easy to understand……now I finally know the extra ocular’s muscles only because of you….
Of some videos I watched, this explains the movement best!
Woah that is what learning is meant to be! Fun! And easy to understand! Thank you so much for your work. I really admire you.
Amazing. Thank you so much, couldn't get my head around this for days.
VERY SIMPLE BUT TOO THE POINT DETAILED EXPLANATION. EXCELLENT
This is by far the best video thanks a lot
Glad it helped
You learn as well as explain at a high level, well that's an ability to admire👋🏽
Thank you so much, sir, this is the best tutorial on extraocular muscles made
Had great confusion about the action of so & io.. Thank u sir to make my concept crystal clear
This is by far the best video, thank you so much :)
This is excellent, explained so clearly thankyou!
Most useful video on eye muscles action thank you so much
Thank you I was lost in eye movement you saved me ................
much simplified and understood...thanks
Great eye movement explanation! Clear and understandable!
Thank you ❤❤❤❤❤❤❤❤❤❤
What a great video
Thank you!
Thanks for this video!
But why do have the different between anatomical and clinical testing ?
Thank you very much
THANK YOU SO MUCH
You're welcome!
Thank you so much!
It.s amazing video
Thank you so much 😀
Thank you from Egypt
Good video
it is excellent Sir! I am wandering if you could provide the ppt for the videos if possible?
i love youuuuuuuu 😭😭😭
👌👌👌
Dear NotedAnatomist thank you for the video but could you please explain further the part where you said the axis of the orbit and that of the eyeball are not the same. Thank you
excellent , perfect , très bien
Merci
thanks anatomist god bless you}
Brilliant!
Finally got it!! thanks a lot
Best video
Thanks🥰
You’re welcome 😊
I can always count on The noted anatomist😌🙏
I'm a bit confused with the clinical testing diagram. how come in the clinical, when u do the H and make the eye look up and in, its labeled the IO instead of the SR. doesn't the SR make you look up and in? it makes sense if that was a representation of the Left eye...is that a mistake?
+Tam Nguyen Hi Tam, this is a confusing element for many medical students. Watch this other tutorial i have about clinically testing eye muscles/nerves ... does this help? ua-cam.com/video/3J2UZiLVZKA/v-deo.html
Thank you!
+Tam Nguyen Did that help Tam?
+Tam Nguyen The challenge here is knowing the difference between the "anatomical" action an eye muscle produces (i.e., the SR moves the eye up and in) versus the "clinical" movement used to test the eye muscle (i.e., you clinically test the SR by abducting then elevating the eye). With the MR and LR muscles it is easy because the MR is the only one muscle that adducts and the LR is the only muscle that abducts the eye in the horizontal plane. Therefore, the "anatomical" actions and "clinical" movements of the MR and LR are the same.
However, when elevating the eye (moving the eye up in the vertical axis) there are two muscles working together (SR moves the eye up and in and IO moves the eye up and out). Therefore, in order to test one muscle (SR) it must be isolated from the other muscle (IO). This is accomplished by moving the eye in such a way as to take away the biomechanical advantage of one muscle in the vertical plane. When an eye is abducted (looking laterally to the wall) this movement removes the biomechanical advantage of the IO from looking up (the movement produced by the IO on an abducted eye is extorsion not elevation). As such, the only eye muscle able to elevate an abducted eye is the SR. Does this help?
Here is a link to a website that is very helpful for testing these concepts: cim.ucdmc.ucdavis.edu/eyes/version15/eyesim.html
+The Noted Anatomist yes definitely cleared things up!
thank you
Thank u alot
is eye ball axes differ from fick's axes
different from this
www.cybersight.org/bins/volume_page.asp?cid=1-2161-2163-2175
No there are the same. I focused primarily on the horizontal and vertical axes in this tutorial.
Best
😊😊😊
👏