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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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Overview of the Skull01:08

Overview of the Skull

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The cranium (skull) is the skeletal structure of the head that supports the face and protects the brain. It is subdivided into the facial bones and the brain case, or cranial vault. The facial bones underlie the facial structures, form the nasal cavity, enclose the eyeballs, and support the teeth of the upper and lower jaws.
The cranial vault surrounds and protects the brain and houses the middle and inner ear structures. This cavity is bounded superiorly by the rounded top of the skull, which...
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Deformations in a Transverse Cross Section01:21

Deformations in a Transverse Cross Section

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When a material is subjected to uniaxial stress, it elongates or contracts in the direction of the applied force, and also undergoes changes in the perpendicular directions. This behavior is crucial for understanding how materials behave under stress and is governed by mechanical properties such as Poisson's ratio v, which measures the ratio of transverse strain to axial strain.
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
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Cranial Bones: Lateral View01:27

Cranial Bones: Lateral View

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The lateral view of the cranium is dominated by temporal, sphenoid, and ethmoid bones.
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...
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Plastic Deformations of Members with a Single Plane of Symmetry01:21

Plastic Deformations of Members with a Single Plane of Symmetry

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When a structural member undergoes plastic deformation due to bending, it is crucial to understand the position of the neutral axis and the stress distribution. This member, characterized by a single plane of symmetry, exhibits a uniform stress distribution, with negative stress above the neutral axis and positive stress below. Notably, the neutral axis does not align with the centroid of the cross-section. This misalignment is typical in cases where the cross-section is not rectangular or...
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Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

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When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
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Related Experiment Video

Updated: Dec 30, 2025

Analysis of Craniomaxillofacial Malformations in Mice Using Three-dimensional Microcomputed Tomography
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Analysis of Craniomaxillofacial Malformations in Mice Using Three-dimensional Microcomputed Tomography

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Morphological consequences of artificial cranial deformation: Modularity and integration.

Thomas A Püschel1, Martin Friess2, Germán Manríquez3,4

  • 1Primate Models for Behavioural Evolution, Institute of Cognitive and Evolutionary Anthropology, University of Oxford, Oxford, United Kingdom.

Plos One
|January 25, 2020
PubMed
Summary

Artificial Cranial Deformation (ACD) impacts skull integration. Oblique ACD increases static integration, while anteroposterior ACD influences developmental integration, revealing distinct effects on cranial modules.

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Area of Science:

  • Anthropology
  • Developmental Biology
  • Biomechanics

Background:

  • The human skull exhibits modular organization, with distinct units interacting during development, a process known as morphological integration.
  • Artificial Cranial Deformation (ACD) involves intentional skull reshaping, offering a unique model to study biomechanical influences on cranial development and integration.

Purpose of the Study:

  • To investigate how Artificial Cranial Deformation (ACD) affects the morphological integration of the human skull.
  • To compare integration patterns in non-deformed skulls versus those subjected to anteroposterior and oblique ACD.

Main Methods:

  • Utilized 3D landmark coordinates from adult crania (non-deformed, anteroposterior ACD, oblique ACD).
  • Assessed developmental and static modularity/integration using Generalized Procrustes Analysis and Partial Least-Squares.
  • Examined covariation patterns between the neurocranium and viscerocranium modules.

Main Results:

  • Confirmed the modular organization of the skull into neurocranium and viscerocranium.
  • Oblique ACD significantly increased static morphological integration by enhancing neuro-viscerocranial covariance.
  • Anteroposterior ACD appeared to influence developmental integration, establishing a more defined covariation pattern.

Conclusions:

  • Artificial Cranial Deformation differentially impacts cranial morphological integration based on the deformation style.
  • Oblique ACD leads to more constrained static integration, while anteroposterior ACD influences developmental integration pathways.