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. 2021 Mar 12;18:11. doi: 10.1186/s12987-021-00248-1

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 5 — a Data from the cranial (blue) and spinal (red) implantation sites during rotations. Separate curve fitting was done for the head-up and head-down rotations, though the slopes were not significantly different. Rotations resulted in significantly lower changes in CSF pressure at the spinal recording site (red) compared to the cranial recording site (blue). b Raw simultaneous data recordings of CSF pressure and electrical stimulation of the suboccipital muscle in Alligator mississippiensis. Stimulation of the muscle was associated with a decrease in CSF pressure. Variation in this response may represent variation in stimulus strength (caused by slight displacement of the muscle relative to the stimulating probe) or possibly fatigue of the muscle. c Simultaneous recordings of CSF pressure from the cranium (top) and spinal canal (middle) of A. mississippiensis. These two CSF traces show clear synchrony, and are synchronized with the (simultaneously recorded) EKG trace (bottom). d Simultaneous recordings of EKG (bottom trace) as well as CSF pressure from the cranium (top) and spinal canal (middle) of A. mississippiensis. There is a temporal offset between the cranial and spinal CSF pulses (red vertical lines), such that the spinal pulse lags behind the cranial pulse by approximately 200 ms