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. 2019 Oct 22;10:1280. doi: 10.3389/fphys.2019.01280

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Copyright © 2019 Bacqué-Cazenave, Fossat, Issa, Edwards, Delbecque and Cattaert.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Effect of 5-HT cell stimulation on the response pattern of the depressor nerve to N2 sensory stimulation. (A) Experimental disposition. (B) Stimulation of the left (ipsilateral) N2 sensory nerve while keeping the left 5-HT cell silent activates the left depressor nerve (light green). (C) Similarly, stimulation of the right (controlateral) sensory nerve while keeping the left 5-HT cell silent activates the right depressor nerve (dark green). (D) Driving the left 5-HT cell by current injection enhances the response of the left (ipsilateral) depressor nerve (blue trace) to stimulation of the left (ipsilateral) N2 sensory nerve. (E) By contrast, the same activation of the left 5-HT cell during right (contralateral) N2 sensory nerve stimulation does not enhance the response of the right (contralateral) depressor nerve (gray trace). (F,G) Comparison of the frequency response of the ipsi/contra depressor nerves to left N2 sensory nerve stimulation in the absence and presence of 5-HT cell stimulation. Whereas a noticeable increase of the response is observed on side ipsilateral to 5-HT cell stimulation (F), no effect is observed in the contralateral side (G). R, right; L, left.