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Quantitative estimation of the primary auditory cortex in human brains.
Emilio Artacho-Pérula1, Javier Arbizu, Maria del Mar Arroyo-Jimenez
1Human Neuroanatomy Laboratory, Department of Health Sciences, School of Medicine and C.R.I.B., University of Castilla-La Mancha, Avda. de Almansa s/n, 02006 Albacete, Spain. Emilio.Artacho@uclm.es
Brain Research
|April 15, 2004
Summary
This study precisely measured the primary auditory cortex (PAC) volume and morphometrics in human brains. Findings reveal minimal differences between hemispheres, crucial for interpreting functional neuroimaging data.
Area of Science:
- Neuroscience
- Neuroanatomy
Background:
- Functional neuroimaging is widely used for human brain studies.
- Accurate morphometric data of the primary auditory cortex (PAC) is essential for precise interpretation of these studies.
Purpose of the Study:
- To determine accurate morphometric parameters and volume of the human primary auditory cortex (PAC).
- To compare morphometric differences between the left and right PAC hemispheres.
Main Methods:
- Systematic sectioning of twelve human temporal lobes orthogonal to the ac-pc line.
- Thionin staining for cytoarchitectonic analysis and parvalbumin staining for neuronal markers.
- Morphometric analysis including size, shape, and volume estimation using the Cavalieri method.
Main Results:
- The primary auditory cortex extended for an average of 24 mm with a volume of 857+/-213 mm3.
- The left PAC was 7% larger than the right, though without significant hemispheric differences in size or form.
- Morphometric parameters showed scarce differences between hemispheres, with a tendency towards irregularity in the left PAC.
Conclusions:
- Morphometric analysis of the PAC provides valuable data for functional neuroimaging studies.
- Results are particularly relevant for lower-resolution techniques like Single Photon Emission Computed Tomography (SPECT).
- The study establishes normative morphometric data for the human PAC.