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Human primary auditory cortex: cytoarchitectonic subdivisions and mapping into a spatial reference system.

P Morosan1, J Rademacher, A Schleicher

  • 1Institute of Medicine, Research Center Jülich, Germany.

Neuroimage
|April 18, 2001
PubMed
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This study maps the human primary auditory cortex (Brodmann area 41) in 3D, identifying three subdivisions within Heschl's gyrus. This provides a precise reference for comparing cytoarchitecture with functional imaging data.

Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Cytoarchitectonics

Background:

  • The human auditory cortex, located in Heschl's gyrus, has existing schematic maps with conflicting data on primary auditory areas.
  • Current maps lack a common spatial reference system for comparing cytoarchitectonic data with functional imaging results.

Purpose of the Study:

  • To create a 3D dataset of the human primary auditory cortex's precise location, extent, subdivisions, and variability.
  • To establish a reliable spatial reference system for comparing cytoarchitectonic maps with functional imaging data.

Main Methods:

  • Quantitative cytoarchitectonic analysis of 10 postmortem brains.
  • Used a novel technique for observer-independent definition of areal borders.
  • Mapped identified areas (Te1.1, Te1.0, Te1.2) to a spatial reference system based on in vivo MRI.

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Main Results:

  • Identified three primary auditory areas (Te1.1, Te1.0, Te1.2) in Heschl's gyrus based on Layer IV development.
  • Found significantly higher cell density in Te1.1 compared to Te1.2 in the left hemisphere.
  • Demonstrated that cytoarchitectonic borders do not consistently align with macroanatomic landmarks.

Conclusions:

  • The study provides a precise 3D cytoarchitectonic map of the human primary auditory cortex.
  • The developed spatial reference system allows for accurate intersubject variability estimation.
  • This framework will facilitate future comparisons between structural and functional imaging data.