Anatomy | Physiology of the Utricle & Saccule [Otolithic Organs]

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[@BassamN711]

I cannot thank you enough, I’ve been struggling to understand this, but you made it crystal clear & that’s cuz you’re tremendously knowledgeable.

[@saharmohammed7924]

Thank you so much! this topic couldn’t have been explained better.

[@CatalystUniversity]

Thank you for the kind words.

[@شذىنضال-ق7ه]

this video saved my life and my medical future

[@sinem1981]

So helpful! Repetitions are great. Thanks a lot for making these videos available to public.

[@cristinacutler5980]

Absolutely incredible!! Thank you so much for the extremely clear and precise explanations

[@zack_120]

It sounds like that the head flexion or turn head left cost less energy as both have less frequent depolarization as compared to head extension and turn to right which cost more energy by triggering more depolarization. So, depending on whether one wants to spend or save energy, the corresponding movements can be prioritized.

[@akhilsl4514]

How beautifully organised lecture it is !!!

[@judges.5992]

Thank you for the details. Everything is easy to understand.

[@kavitajoshi4212]

please explain how bending flexing the neck forward is a linear movement? otoliths are sensitive to linear acceleration or deceleration. bending the head seems more angular movement which should be detected by the semicircular canals.

[@Ammadkh24]

The movement of tilting the head forward will be registered by the semicircular canals as well. Static position of head with neck flexion changes the axis of the otolith so when gravity acts on the otoliths they will register the same was as with linear acceleration. If you're familiar with physics you can think of force of gravity down the "ramp" of the otolith membrane as linear acceleration.

[@FisherCatProductions]

Clear and concise explanation. Many Internet sources make it sound as though an otolith is connected to the end of each cilia "like a crystal on the end of a blade of grass." This is a much better depiction. One question: diagram "D" shows the cilia being forced right under acceleration. Should not the otolithic membrane also be bulging right under acceleration as in "B"--since the membrane is what actually manipulates the cilia?

[@robferrell7262]

Very informative, thank you for taking the time to make this video. There was however a part of the video with some miss information that I'd like to bring your attention to. When you were talking about deceleration in relationship with head extension, and acceleration in relation to head flexion, you actually have those backwards. Deceleration will give the same feedback as head flexion, and acceleration will do the same as head extension. Otherwise you video was very accurate and well explained.

[@emilychance1426]

Thanks so much for this info! I'm currently dealing with vertigo and this really helped me understand what's going on ❤️

[@bhags815]

Great material! Clears things up after a lecture perfectly

[@razanalnajjar9112]

Ah thankyou so much! You made it so easy! Love and respect from 🇵🇰

[@loveenaluximon5184]

Subscribed on the spot! Ouuuff such a clear explanation ! So great

[@alexandermagnus6947]

Thank you, one of the best videos on this subject :)

[@shrutea-8127]

The video was extremely helpful and made this topic so much easier to understand!

[@zenjinneering]

Linear acceleration does not mean linear direction. Linear acceleration implies a constant (linear) increase in velocity over time. You can linearly accelerate around a curve, for example. Great video, thanks.

[@blisterywolf]

Great video!

[@hebaelnabawy8871]

so at head flexion hair cells where bending with the direction of otolith movement just fine. but when it's right of left deceleration the inertia concept just shows up!

[@vitaly-1673]

Thank you very much! Everything is very clear!

[@CatalystUniversity]

Thank you!

[@chandanar339]

Best explanation sir.thank you

[@arhamshamsi2926]

Hi, Thank you very much for wonderful lecture,I just have one question, why there is increase firing rate of neurons in head extension movement ?

[@noamanali9023]

Excellent

[@yasmincetin6720]

incredible video, thank you

[@stonehead2038]

In this case, when we go in one direction, the inertia doesnt move the endolymph in the opposite direction like in the case of semicircular canals?

[@granthagen3207]

If utricle transduces left/right acceleration and saccule transduces up/down acceleration, what transduces front/back acceleration (as in your car driver example)? Or does the utricle transduce all horizontal acceleration including front/back?

[@rxx3081]

Great video, thanks so much!

[@FerbFletcher-w2x]

Thank you!

[@ramaabdulkafi1494]

Really thank you , it was very very helpful.

[@davidoconnor8966]

Thank you for a very helpful video. How is head movement during car acceleration or deceleration, called left and right linear acceleration ? Why is is not called forwards and backwards linear acceleration ?

[@barbaradonohue4822]

Because I think the way the utricle is positioned in the head.

[@corneliameiler6099]

I think it‘s just describing the slide. Forward=right on the slide, but in reality it’s anteriorly, if that makes sense

[@nishichelwani6834]

Thank you!Great video👍🏼

[@eebaabdi9902]

Amazing. Seriously, ❤️❤️😍☺️

[@doctormaryanne.]

I do not understand what you mean by linear acceleration to the left. Please what does that mean ???

[@swarnapriya8430]

Bestest video!😊👌👌

[@guillermodozal7166]

At the beginning of the video I heard that there was a little difference between the utricle and the sacule, which would be explained at the end. Did I miss that little detail, or was that just a ruse to keep us watching?

[@eliasschmid5079]

the difference is the positioning, that one is horizontal and the other vertical (I guess a year to late to answer, but better late than never xD)

[@shingweichew3956]

Thank you so much! So nicely taught, i am finally able to understand how the vestibule works after so long.

[@silvaadamian9678]

i enjoy your lecture

[@amolsawant5265]

Does otoliths dissolve in canal or utricle after dislodge

[@robertacree321]

Kudos! Well done! This enhances my audiology knowledge greatly.

[@capricefoster2267]

Why when you accelerate/decelerate do the otoliths not move in the same way they do in flexion/extension?

[@legendarling2634]

When the head undergoes linear acceleration, the greater relative mass of the otolithic membrane causes it to lag behind the macula temporarily, which in turn leads to transit displacement of the stereocilia.

[@gerpt17]

left out striola? doesn't really explain how you get response in combination of directions

[@Bertrand-h6v]

great

[@MdAslam-us5ed]

Awesome

[@shio9517]

7/3 is the SAT-like test(but hard af) in Taiwan and I'm watching this in 7/1......

[@엉냔안녕]

How about exam? Just checking

[@MuffinstoMangos]

I have Bppv. I hate those otoliths...

[@salehujeem4730]

You didn’t explain why bending head to left side increase firing level while to right side decreased

[@gangrenefantasia4936]

I guess its more about whether it is bending "towards" or "away from" the kinocilium (the tallest cilium), where "towards kinocilium" increases the signal, and "away from kinocilium" inhibits signal firing...I remember this increase/decreased firing action is related to the structure of ion channels on the kinocilium what open and close according to the direction the kinocilium is bent...for more details might need to look that up as well.
(for anyone if I'm wrong please correct me thanks!)

[@VarmahHari]

​@@gangrenefantasia4936 u r correct

[@repentance1748]

Thank you!! One of the best videos, please make one about hearing and spatial senses

[@CatalystUniversity]

Thank you. Currently I do have some videos over hearing. I am planning on making a couple over taste and smell as well.

[@furryglen]

In your example, head extension causes hair cells to shift posteriorly. This results in increased nerve firing. In the case of linear acceleration, hair cells of passenger in car would also shift posteriorly and nerve firing should also increase. Your example shows that nerve firing would decrease which doesn't make sense to me. Please explain. Thanks!

[@sheikhfaisal2256]

Respected Sir, I had have some hearing issues. Anyone attention to me In first time. I can't understand that word in first time spoke. Even When They repeat again that word. Also upper neck Pain with shoulder every day off. What kind of problems. Kindly advise

[@2ndchancehypnotherapy]

Thank you for making this clear! I had a hard time understanding it from my text book.

[@alans172]

The diagram "(D) Linear acceleration to the left" is a bit confusing. It it shows only the cilia deflected to the right with no deflection of the membrane or the otoliths. Surely it should show the otoliths and otolithic membrane deflected towards the right as well as the cilia.

[@Ben-dl9sp]

So the otoliths and otolithic membrane only shift when the head is tilted?

[@JJmx19]

This is great! the car examples and variety of images really does a lot!

[@Crossing_beau]

I wanna see a picture of saccule otolith

[@manartalha6142]

Does the rate of firing depend on whether the stereocilia move towards or away from the kinocilium?

[@satyakidey1520]

yeah it does...if the stereocilia moves towards the kinocilium, the firing rate will increase

[@kajolswa3883]

best video

[@antonioluisalquizar1536]

Is this the tonic firing rate ?

[@brainryutube]

Awesome lecture!!!!! Can't thank you enough!!!!!

[@CatalystUniversity]

Thank you!

[@hossiengoli6493]

thank you

[@nw1805]

I have a question. I've read that head extension & head flexion are done by the semicircular canals (rotation) instead of the otolithic organs (doing linear acceleration). But here you also talked about head extension & head flexion in the utricle and saccule. So I don't understand, what am I missing?

[@mb5101]

Thank you! the best video I could find for my questions

[@CatalystUniversity]

Thank you!

[@bounlathhansackda7079]

Very educational.vertigo x3. Had left and right ears. Still got this prolonged imbalance. Could l be having vertical nodding crystals drifted out of place. Almost sudden shift movent in the mind.....standing or getting up from bed.....

[@tenacious_takakumi2680]

Sooo is’t that the saccule/utricle tell the brain the head’s position when tilting but the semicircular canals tell the brain the movement of the tilting?

[@tota9868]

Great explanation and waiting for more😍 👌👌👌👌❤️❤️❤️ thank u so much

[@zaynahmed]

is the endolymph relevant for utricle and saccule or is that only for semicircular canals and cochlea?

[@mrinmayeeb5734]

Thank you for giving such a detailed explanation. It was very helpful!

[@CatalystUniversity]

Glad this helped you!

[@michaelc1394]

Really appreciate your videos - so helpful. Thank you.

[@hurueli]

Amazingly clear video lesson. Thanks.

[@marcuschan5963]

Why macula does not need basal cell to generate new supporting cell and hair cell?

[@Aman-qr6wi]

This was very useful for my premed entrance exam.

[@abdulkhaleqalkadimi813]

You deserve all support, I have liked and subscribed the channel..your explanation is organized and on the point, many thanks

[@ibrahemjumah271]

Thanks you so mush 😊❤️ to post this video and put all this work in it 💝

[@bublisoniyak6227]

Omg😭😭
Thank you so much Sir!!
🙌🙌🙌

[@Velaya818]

Great explanation! 👍Thank you!

[@catalinagraciabolivar2547]

Such an amazing video, really clear!!

[@stephinabraham1117]

Finallyyyyyyyyy.... Thank youuuuuuuuuuu!!!!!!

[@PantherJaguar]

Thank you for your help! I was struggling with this and this video made it easy to understad!

[@sebastianbancroft7184]

You're the best! unlike my teacher :(

[@angeljones3367]

Easy understanding with 4 slides

[@meghanavishkant9139]

Thank you.. 🤗 you made it easy

[@mr_io]

Hi there! Where did you get your slides?

[@AmitisL]

Very helpful , thank you

[@ramaabdulkafi1494]

Amazing, Thank you

[@nabeelloai2153]

Thank you so much 💓 🔆🌹

[@salemomaer1167]

very informative

[@anafalcao4407]

Thank you!

[@medzac8794]

Amazing

[@imrobloxgirl7779]

I don't normally subscribe but you sir explained everything clear. Subscribed!

[@CatalystUniversity]

Awesome, thank you!