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. 2017 Nov 22;37(47):11353–11365. doi: 10.1523/JNEUROSCI.1711-17.2017

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Copyright © 2017 Schoppik et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License Creative Commons Attribution 4.0 International, which permits unrestricted use, distribution and reproduction in any medium provided that the original work is properly attributed.

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Figure 6. — The simplified neural circuit underlying the ocular response to pitch and roll tilts. Cyan represents nose-down. Magenta represents nose-up channels. A, Wiring diagram of one hemisphere of the excitatory vestibulo-ocular circuit showing utricular hair cells (cyan/magenta), stato-acoustic ganglion (SAG), central vestibular neurons (VN, cyan and magenta), extraocular motoneuron pools in nIII (SR, IR, IO) and nIV (SO). B, During a roll tilt to the fish's left, the left utricle hair cells (cyan/magenta) are activated, causing cocontraction of superior (SO/SR) eye muscles ipsilateral to the activated utricle, and inferior (IO/IR) muscles contralateral to the activated utricle. C, Utricular hair cells sensitive to nose-up pitch tilts (magenta) ultimately activate only vestibular neurons that project to both nIII and nIV, activating SO (contralateral) and IR (ipsilateral). D, Utricular hair cells sensitive to nose-down pitch tilts (cyan) ultimately activate vestibular neurons that project to exclusively to nIII, activating SR (contralateral) and IO (ipsilateral).