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Related Concept Videos

Sutures of the Skull01:22

Sutures of the Skull

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The human skull is composed of several bones that come together to protect the brain and support the structures of the face. The junctions where these bones meet are called sutures.
Sutures are immobile joints between adjacent bones of the skull. The narrow gap between the bones is filled with dense, fibrous connective tissue that unites the bones. The long sutures located between the skull bones are not straight but instead follow irregular, tightly twisting paths. These twisting lines tightly...
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Structural Joints: Cartilaginous Joints01:17

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As the name indicates, at a cartilaginous joint, the adjacent bones are united by cartilage, a tough but flexible type of connective tissue. Unlike synovial joints, these types of joints lack a joint cavity and involve bones joined together by either hyaline cartilage or fibrocartilage.
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Synchondrosis
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Author Spotlight: PEGASOS Tissue Clearing Technique to Visualize Bone Remodeling
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Computationally modelling the mechanical behaviour of turtle shell sutures-A natural interlocking structure.

B Alheit1, S Bargmann2, B D Reddy3

  • 1Centre for Research in Computational & Applied Mechanics, University of Cape Town, 7701 Rondebosch, South Africa; Department of Mechanical Engineering, University of Cape Town, 7701 Rondebosch, South Africa.

Journal of the Mechanical Behavior of Biomedical Materials
|September 22, 2020
PubMed
Summary

Turtle shell sutures cushion bone from predator attacks by absorbing impact energy. Mathematical modeling reveals these collagenous tissues enhance shell defense against fractures.

Keywords:
CompositeFinite element analysisInterlocking structureProtective structureSutureTurtle shell

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Area of Science:

  • Biomechanics
  • Materials Science
  • Paleontology

Background:

  • Turtle shells (carapaces) are complex structures providing defense.
  • Sutures, collagenous tissues connecting bony plates, are crucial for shell mechanics.
  • Understanding suture mechanics is key to carapace function and evolution.

Purpose of the Study:

  • To investigate the mechanical behavior of turtle shell suture regions using mathematical modeling.
  • To elucidate the role of sutures in carapace response to loading and predator attacks.
  • To analyze the influence of suture geometry and material properties on shell integrity.

Main Methods:

  • Developed a geometrically realistic 3D mathematical model of suture regions.
  • Incorporated hyperelastic, anisotropic, and incompressible material properties for suture tissue.
  • Utilized a novel method to define collagen fiber directions within the sutures.
  • Validated the model against physical three-point bending tests.

Main Results:

  • The model accurately replicated qualitative and quantitative aspects of suture mechanical behavior.
  • Sutures were found to increase the energy required for a predator attack.
  • Sutures effectively cushion the underlying bone, preventing fracture.
  • Longer bony protrusions enhance strain energy absorption but increase fracture risk.

Conclusions:

  • Sutures play a vital role in the mechanical resilience and protective function of turtle shells.
  • The developed mathematical model provides valuable insights into suture biomechanics.
  • Suture properties are critical for optimizing shell performance against mechanical stresses and predator interactions.