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Related Concept Videos

Classification of Bones01:18

Classification of Bones

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The bones of the human skeletal system are of varied shapes, sizes, and functions. They can be classified based on their shape and function into four major classes: long bones, short bones, flat bones, and irregular bones. Some classifications include a fifth type, the sesamoid bones, as a separate class, whereas others categorize them under short bones.
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The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
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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.
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Vertebral Column: Regions and Curvature01:16

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The vertebral column or spine is a flexible column that supports the head, neck, and body and  allows for their movements. It also protects the spinal cord.
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Compact Bone01:27

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Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
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All bones comprise an outer layer of compact bone, and an interior made up of spongy bone tissue, also called cancellous or trabecular bone. In long bones, spongy bone tissue is mainly found in the interior of the epiphyses (broad ends of the bone).
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Related Experiment Video

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Author Spotlight: Enhancing Accuracy and Reproducibility in Whole Bone Bending Tests
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Curved bones: An adaptation to habitual loading.

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  • 1School of Anatomy, Physiology and Human Biology, University of Western Australia, 35 Stirling Hwy, Crawley 6009, Australia.

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|July 23, 2016
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Summary

Long bone curvature, a paradox, is explained by locomotion demands. Bone shape counters bending strains from muscles like the triceps, enhancing skeletal resilience and reducing fracture risk.

Keywords:
Curved bonesFinite elements analysisRadioulna

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Area of Science:

  • Biomechanics
  • Evolutionary Biology
  • Mammalian Anatomy

Background:

  • Long bone curvature presents a biomechanical paradox, seemingly increasing fracture risk under load.
  • This curvature is common in mammalian skeletons, particularly in limb bones involved in locomotion.

Purpose of the Study:

  • To develop a theoretical model explaining the adaptive significance of long bone curvature.
  • To investigate the role of muscle-induced bending strains in shaping bone morphology.

Main Methods:

  • Development of a theoretical biomechanical model.
  • Finite element analysis comparing a curved llama radioulna with a straightened model.
  • Simulation of muscle forces and longitudinal loads.

Main Results:

  • The model demonstrates that bone curvature effectively counters bending strains induced by locomotion, specifically the triceps muscle.
  • Curved bones exhibit enhanced resilience, acting as pre-stressed beams or struts.
  • A straightened bone model showed increased susceptibility to bending strains.

Conclusions:

  • Long bone curvature is an evolutionary adaptation to predictable biomechanical stresses during locomotion.
  • This adaptation optimizes skeletal function by mitigating fracture risk and enhancing load-bearing capacity.
  • The findings provide a physiological mechanism explaining the development of curved long bones in mammals.