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. 2016 Sep 6;16(1):181. doi: 10.1186/s12862-016-0744-7

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. 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.

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Fig. 12 — Innervation of the digestive tract in Amathia gracilis. Longitudinal a–b and transversal (c) ultrathin sections. a Portion of the pharynx wall with the circular neurite bundles. b Medial visceral nerve (in the circle). c Neurite bundle in the vestibulum wall contains giant neurites and nerve fibers of common diameter. Abbreviations: cpn - circum-pharyngeal neurite bundle; gnf - giant nerve fiber; mlp - muscular lining of pharynx; myf - myofilaments; mvn - medial visceral nerve; nf - nerve fibers; phr - pharynx; tmt - thick microtubules; vw - wall of vestibulum