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[The temporo-mandibular articulation].

J Dargaud1, H Vinkka-Puhakka

  • 1Hôpital de l'Hôtel Dieu, Service de Stomatologie et d'Implantologie, 1, place de l'Hôpital, 69288 Lyon, France. j.dargaud@suomi24.fi

Morphologie : Bulletin De L'Association Des Anatomistes
|June 24, 2004
PubMed
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Human bipedalism influences temporo-mandibular joint (TMJ) anatomy and chewing. This study examined TMJ structure and function using dissection and imaging, revealing typical anatomical features but occasional ligament variations.

Area of Science:

  • Anatomy
  • Biomechanics
  • Evolutionary Biology

Background:

  • Human bipedalism is a key evolutionary trait influencing whole-body functional changes.
  • The temporo-mandibular joint (TMJ) and masticatory system exhibit adaptations related to upright posture.

Purpose of the Study:

  • To investigate the morphological and functional adaptations of the human temporo-mandibular joint (TMJ) in relation to bipedalism.
  • To describe the anatomy, biomechanics, and radiological imaging of the TMJ articulation.

Main Methods:

  • Descriptive anatomy via traditional dissection techniques on 20 TMJ joints from 10 cadavers (aged 60-75 years).
  • Radiological imaging (lateral view X-rays) of TMJ in subjects across a wide age range (3 months to 75 years).

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Main Results:

  • Anatomical elements of the TMJ, including the capsule, ligament, and masticatory muscles, generally aligned with existing literature.
  • The temporo-mandibular ligament showed variability, occasionally being difficult to distinguish from the capsule or absent post-dissection.

Conclusions:

  • The study confirms typical TMJ anatomical structures but highlights potential variations in the temporo-mandibular ligament.
  • Further research may be needed to understand the functional implications of TMJ ligament variability in human evolution and function.