Special Senses | Cochlea | Spiral Organ of Corti

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indeed

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[@marmar-u4t]

Just to clarify on outer hair cells. Just like inner hair cells, outer hair cells also have K+ channels and tip links. When the endolymph moves, both hair cells types move and both cell types have a surge of K+ into the cell (depolarization). HOWEVER, the difference that in outer hair cells the depolarization changes the membrane potential and that causes prestin to relax and elongate the cell. This is STEP 1 of the process. The second step would be the release of ACh from the olivocochlear bundle, which like Ninja Nerd said hyperpolarizes the cell by letting K+ exit the cell. This causes prestin to contract so that the outer hair cell returns to its original shape to be ready for the next cycle. This video was PHENOMENAL as all other videos, but I just wanted to add a side note for those who want to know the chronological order of the outer hair cell function.

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[@hannahburkert8742]

Thanks for this great video! Just wanted to say that there is NO kinocilium in the Cochlea, but only in the vestibular organ. The kinocilium disappears after maturation and only stereocilia are left. Anyways, you do such an amazing job! Thank you so much

[@ghazalamfarrukh1769]

Yes macula and Stria have kinociliym BUT guyton also states their presence in organ of corti too

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best medical school lectuureee channel:")

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[@Gabriel-yc1kx]

At 04:17 In the scala media, the structure responsible for secreting K+ ions is the stria vascularis (not medullaris)

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GRATITUDE 🦋 This video TRULY helped me innerstand an earache I was having and what I should do in the future to maintain Healthy and balanced hearing. Thank you so much!!

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[@kristinehinzel9426]

Really great video! However one thing to be aware of; the kinocilia does not excist on the hair cells in the cochlea (the auditory system), they are only situated on the hair cells in the vestibular

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