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Volume of the crocodilian brain and endocast during ontogeny

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    SYSNO ASEP0475786
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleVolume of the crocodilian brain and endocast during ontogeny
    Author(s) Jirák, D. (CZ)
    Janáček, Jiří (FGU-C) RID, ORCID
    Article numbere0178491
    Source TitlePLoS ONE
    Roč. 12, č. 6 (2017)
    Number of pages10 s.
    Languageeng - English
    CountryUS - United States
    Keywordsbrain volume ; endoneurocranium ; crocodilians ; magnetic resonance imaging
    Subject RIVEA - Cell Biology
    OBOR OECDDevelopmental biology
    R&D ProjectsGAP302/12/1207 GA ČR - Czech Science Foundation (CSF)
    GA13-12412S GA ČR - Czech Science Foundation (CSF)
    Institutional supportFGU-C - RVO:67985823
    UT WOS000403280900018
    EID SCOPUS85020923940
    DOI10.1371/journal.pone.0178491
    AnnotationUnderstanding complex situations and planning difficult actions require a brain of appropriate size. Animal encephalisation provides an indirect information about these abilities. The brain is entirely composed of soft tissue and, as such, rarely fossilises. As a consequence, the brain proportions and morphology of some extinct vertebrates are usually only inferred from their neurocranial endocasts. However, because the morphological configuration of the brain is not fully reflected in the endocast, knowledge of the brain/endocast relationship is essential (especially the ratio of brain volume to endocast volume or the equivalent proportion of interstitial tissue) for studying the endocasts of extinct animals. Here we assess the encephalic volume and structure of modern crocodilians. The results we obtained using ex vivo magnetic resonance imaging reveal how the endoneurocranial cavity and brain compartments of crocodilians change configuration during ontogeny. We conclude that the endocasts of adult crocodilians are elongated and expanded while their brains are more linearly organised. The highest proportion of brain tissue to endocast volume is in the prosencephalon at over 50% in all but the largest animals, whereas the proportion in other brain segments is under 50% in all but the smallest animals and embryos. Our results may enrich the field of palaeontological study by offering more precise phylogenetic interpretations of the neuroanatomic characteristics of extinct vertebrates at various ontogenetic stages.
    WorkplaceInstitute of Physiology
    ContactLucie Trajhanová, lucie.trajhanova@fgu.cas.cz, Tel.: 241 062 400
    Year of Publishing2018
Number of the records: 1