Lecture 3. The Vestibular System Structure, Function and Dysfunction 

Mohomed Choksi Right

the orientation of the canals change and thus the orientation of the cupula changes too. so when the warm water is applied and it makes the endolymph lighter- the endolymph rises and moves away from the cupula - i.e. it ''pulls'' from the cupula thus causing inhibition of the right canal. Hope that helps!

Yup..for me too.. couldn't understand that concept though...

@@divanshi4894 but when SCC was on horizontal line,je said that when applied with warm water,endolymph become lighter and it moves and pushes the cochlea.but when we are in prone position,he said that when applied with warm water,it moves away from cupula..?how's that?🤔🤔

@@bellwellteamz3986 Heyy! So, the point is that when the patient goes prone, the entire canal flips over, (which means the ampulla flips over too) so the orientation of the hair cells also changes -> the orientation of the kinocilium with respect to the stereocilia changes. So when you apply warm water and the endolymph rises, the convection currents move the stereocilia away from the kinocilium (which is equivalent to inhibition of that canal). The lighter the endolymph, the more it will move upwards; so in prone position (face down), the canals themselves move. Thus, ''upwards'' for the endolymph changes in accordance! at 32:48 he wiggles his fingers to symbolise the ampula (which is now down) so if the endolymph were to ''rise'' from where his fingers are and move upwards, it would have to pull the stereocilia and thus inhibit the right canal. Does that make sense or have I made it worse lol

@@divanshi4894 hihi...yup got it...but can u pls explain the same on the first scenario which he explained..(before the prone position)

They can watch it at 1.5 speed, gets a little shorter that way.