The biomechanical role of the chondrocranium and sutures in a lizard cranium

Marc E H Jones, Flora Gröning, Hugo Dutel, Alana Sharp, Michael J Fagan, Susan E. Evans

Research output: Contribution to journalArticle

6 Citations (Scopus)
10 Downloads (Pure)

Abstract

The role of soft tissues in skull biomechanics remains poorly understood. Not least, the chondrocranium, the portion of the braincase which persists as cartilage with varying degrees of mineralization. It also remains commonplace to overlook the biomechanical role of sutures despite evidence that they alter strain distribution. Here, we examine the role of both the sutures and the chondrocranium in the South American tegu lizard Salvator merianae. We use multi-body dynamics analysis (MDA) to provide realistic loading conditions for anterior and posterior unilateral biting and a detailed finite element model to examine strain magnitude and distribution. We find that strains within the chondrocranium are greatest during anterior biting and are primarily tensile; also that strain within the cranium is not greatly reduced by the presence of the chondrocranium unless it is given the same material properties as bone. This result contradicts previous suggestions that the anterior portion (the nasal septum) acts as a supporting structure. Inclusion of sutures to the cranium model not only increases overall strain magnitudes but also leads to a more complex distribution of tension and compression rather than that of a beam under sagittal bending
Original languageEnglish
Article number20170637
JournalJournal of the Royal Society Interface
Volume14
Issue number137
Early online date20 Dec 2017
DOIs
Publication statusPublished - Dec 2017

Fingerprint

Lizards
Skull
Sutures
Nasal Septum
Biomechanical Phenomena
Cartilage
Biomechanics
Bone and Bones
Dynamic analysis
Materials properties
Bone
Tissue

Keywords

  • chondrocranium
  • FEA
  • skull structure
  • septum
  • cartilage

Cite this

The biomechanical role of the chondrocranium and sutures in a lizard cranium. / Jones, Marc E H; Gröning, Flora; Dutel, Hugo ; Sharp, Alana ; Fagan, Michael J; Evans, Susan E.

In: Journal of the Royal Society Interface, Vol. 14, No. 137, 20170637, 12.2017.

Research output: Contribution to journalArticle

Jones, Marc E H ; Gröning, Flora ; Dutel, Hugo ; Sharp, Alana ; Fagan, Michael J ; Evans, Susan E. / The biomechanical role of the chondrocranium and sutures in a lizard cranium. In: Journal of the Royal Society Interface. 2017 ; Vol. 14, No. 137.
@article{0500540ffec64594ae993b72736a8fb9,
title = "The biomechanical role of the chondrocranium and sutures in a lizard cranium",
abstract = "The role of soft tissues in skull biomechanics remains poorly understood. Not least, the chondrocranium, the portion of the braincase which persists as cartilage with varying degrees of mineralization. It also remains commonplace to overlook the biomechanical role of sutures despite evidence that they alter strain distribution. Here, we examine the role of both the sutures and the chondrocranium in the South American tegu lizard Salvator merianae. We use multi-body dynamics analysis (MDA) to provide realistic loading conditions for anterior and posterior unilateral biting and a detailed finite element model to examine strain magnitude and distribution. We find that strains within the chondrocranium are greatest during anterior biting and are primarily tensile; also that strain within the cranium is not greatly reduced by the presence of the chondrocranium unless it is given the same material properties as bone. This result contradicts previous suggestions that the anterior portion (the nasal septum) acts as a supporting structure. Inclusion of sutures to the cranium model not only increases overall strain magnitudes but also leads to a more complex distribution of tension and compression rather than that of a beam under sagittal bending",
keywords = "chondrocranium, FEA, skull structure, septum, cartilage",
author = "Jones, {Marc E H} and Flora Gr{\"o}ning and Hugo Dutel and Alana Sharp and Fagan, {Michael J} and Evans, {Susan E.}",
note = "We thank the Biotechnology and Biological Sciences Research Council (BBSRC) who provided funding for this research (BB/H011854/1; BB/H011668/1; BB/H011390/1; BB/M010287/1; BB/M008525/1; BB/M008061/1) and a Discovery Early Career Researcher Award DE130101567 (Australian Research Council) which has supported MEHJ.",
year = "2017",
month = "12",
doi = "10.1098/rsif.2017.0637",
language = "English",
volume = "14",
journal = "Journal of the Royal Society Interface",
issn = "1742-5689",
publisher = "Royal Society of London",
number = "137",

}

TY - JOUR

T1 - The biomechanical role of the chondrocranium and sutures in a lizard cranium

AU - Jones, Marc E H

AU - Gröning, Flora

AU - Dutel, Hugo

AU - Sharp, Alana

AU - Fagan, Michael J

AU - Evans, Susan E.

N1 - We thank the Biotechnology and Biological Sciences Research Council (BBSRC) who provided funding for this research (BB/H011854/1; BB/H011668/1; BB/H011390/1; BB/M010287/1; BB/M008525/1; BB/M008061/1) and a Discovery Early Career Researcher Award DE130101567 (Australian Research Council) which has supported MEHJ.

PY - 2017/12

Y1 - 2017/12

N2 - The role of soft tissues in skull biomechanics remains poorly understood. Not least, the chondrocranium, the portion of the braincase which persists as cartilage with varying degrees of mineralization. It also remains commonplace to overlook the biomechanical role of sutures despite evidence that they alter strain distribution. Here, we examine the role of both the sutures and the chondrocranium in the South American tegu lizard Salvator merianae. We use multi-body dynamics analysis (MDA) to provide realistic loading conditions for anterior and posterior unilateral biting and a detailed finite element model to examine strain magnitude and distribution. We find that strains within the chondrocranium are greatest during anterior biting and are primarily tensile; also that strain within the cranium is not greatly reduced by the presence of the chondrocranium unless it is given the same material properties as bone. This result contradicts previous suggestions that the anterior portion (the nasal septum) acts as a supporting structure. Inclusion of sutures to the cranium model not only increases overall strain magnitudes but also leads to a more complex distribution of tension and compression rather than that of a beam under sagittal bending

AB - The role of soft tissues in skull biomechanics remains poorly understood. Not least, the chondrocranium, the portion of the braincase which persists as cartilage with varying degrees of mineralization. It also remains commonplace to overlook the biomechanical role of sutures despite evidence that they alter strain distribution. Here, we examine the role of both the sutures and the chondrocranium in the South American tegu lizard Salvator merianae. We use multi-body dynamics analysis (MDA) to provide realistic loading conditions for anterior and posterior unilateral biting and a detailed finite element model to examine strain magnitude and distribution. We find that strains within the chondrocranium are greatest during anterior biting and are primarily tensile; also that strain within the cranium is not greatly reduced by the presence of the chondrocranium unless it is given the same material properties as bone. This result contradicts previous suggestions that the anterior portion (the nasal septum) acts as a supporting structure. Inclusion of sutures to the cranium model not only increases overall strain magnitudes but also leads to a more complex distribution of tension and compression rather than that of a beam under sagittal bending

KW - chondrocranium

KW - FEA

KW - skull structure

KW - septum

KW - cartilage

U2 - 10.1098/rsif.2017.0637

DO - 10.1098/rsif.2017.0637

M3 - Article

VL - 14

JO - Journal of the Royal Society Interface

JF - Journal of the Royal Society Interface

SN - 1742-5689

IS - 137

M1 - 20170637

ER -