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The primate motor thalamus

G Percheron1, C François, B Talbi

  • 1Laboratoire de Neuromorphologie informationnelle et de neurologie expérimentale du mouvement INSERM U106, Pavillon INSERM, Hôpital de la Salpêtrière, Paris, France.

Brain Research. Brain Research Reviews
|August 1, 1996
PubMed
Summary

This study redefines the motor thalamus in primates, clarifying its functional anatomy and resolving historical nomenclature issues for improved clinical stereotaxy. It identifies three distinct subcortical territories: cerebellar, pallidal, and nigral.

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Area of Science:

  • Neuroscience
  • Primate Anatomy
  • Functional Neuroanatomy

Background:

  • Historical and technical issues have created confusion in the functional parcellation of the primate motor thalamus.
  • Conflicting nomenclatures and outdated conceptions of thalamic nuclei have hindered precise understanding.
  • Previous parcellations of the lateral thalamic region are deemed inappropriate for current clinical and research needs.

Purpose of the Study:

  • To establish a new, rational, and historically grounded parcellation and nomenclature for the lateral region of the motor thalamus.
  • To precisely define thalamic elements, including 'regions,' 'territories,' 'subregions,' and 'nuclei,' based on afferent and efferent connections.
  • To analyze the functional anatomy of the motor thalamus using precise topography and 3D reconstructions of subcortical afferent territories.

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Main Methods:

  • Utilized large injections to map the maximal extent of cerebellar, pallidal, and nigral afferent territories in the motor thalamus.
  • Employed orthogonal teleradiography with ventricular landmarks (CA-CP) for accurate cartography.
  • Performed 3D reconstructions, rotations, and 'reslicing' to analyze intra- and interspecific variations and cartographic precision in macaques.

Main Results:

  • The motor thalamus is composed of three distinct and separate topographically organized territories: cerebellar, pallidal, and nigral.
  • These territories collectively occupy the entire anterior part of the lateral thalamic region.
  • No evidence supports the isolation of a nucleus lateralis polaris or a polar VA, as these lack distinct lower afferent territories.

Conclusions:

  • A new parcellation and nomenclature for the motor thalamus, based on rational and historically grounded rules, has been established.
  • The findings clarify the functional anatomy of the motor thalamus, resolving long-standing confusion and improving stereotactic accuracy.
  • The proposed definitions of thalamic elements provide a precise framework for future research and clinical applications.