Organ of Corti vibrations are dominated by longitudinal motion in vivo.

Organ of Corti vibrations are dominated by longitudinal motion in vivo.
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DOI:
10.1038/s42003-022-04234-7
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发表时间:
2022-11-24
影响因子:
5.9
通讯作者:
--
中科院分区:
生物学2区
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最近使用光学相干断层扫描(OCT)对耳蜗Corti感觉器官(ooC)的声音诱发振动的观察揭示了意外和复杂的运动。解释这些结果在毛细胞转导之前的微机械内耳过程是不平凡的,因为OCT只测量真实运动的投影,其中可能包括横向和纵向位移。我们测量ooC运动在多个OCT光束的角度相对于纵轴的基底膜(BM)通过使用耳蜗的自然曲率,发现外毛细胞(OHC)和BM之间的相对相位随这个角度而变化。这包括相对突然的相位反转,其中对于负(正)射束角,OHC分别领先(滞后)BM约0.25个周期。我们将这些结果解释为ooC内显著纵向运动的证据,这在解释(相对)ooC振动时应考虑到内耳声音处理。多角度光学相干断层扫描测量将Corti器官振动与内耳声音处理中的复杂运动联系起来。
Recent observations of sound-evoked vibrations of the cochlea’s sensory organ of Corti (ooC) using optical coherence tomography (OCT) have revealed unanticipated and complex motions. Interpreting these results in terms of the micromechanical inner-ear processes that precede hair-cell transduction is not trivial since OCT only measures a projection of the true motion, which may include transverse and longitudinal displacements. We measure ooC motions at multiple OCT beam angles relative to the longitudinal axis of the basilar membrane (BM) by using the cochlea’s natural curvature and find that the relative phase between outer hair cells (OHC) and BM varies with this angle. This includes a relatively abrupt phase reversal where OHC lead (lag) the BM by ~0.25 cycles for negative (positive) beam angles, respectively. We interpret these results as evidence for significant longitudinal motion within the ooC, which should be considered when interpreting (relative) ooC vibrations in terms of inner-ear sound processing. Multi-angle optical coherence tomography measurements link organ of Corti vibrations to complex motions in inner-ear sound processing.
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