Symmetry and Asymmetry in the Human Posterior Thalamus: I. Cytoarchitectonic Analysis in Normal Persons

doi:10.1001/archneur.1982.00510180003001

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Vol. 39 No. 6, June 1982

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Symmetry and Asymmetry in the Human Posterior Thalamus

I. Cytoarchitectonic Analysis in Normal Persons

David Eidelberg, MD; Albert M. Galaburda, MD

Arch Neurol. 1982;39(6):325-332.

Abstract

• We parceled the posterior thalami of nine normal humanbrains according to cytoarchitectonic criteria, measured relevantnuclear volumes, and sought leftright asymmetries. We foundthat thalamic zones with multiple projections to the cerebralcortex, using the centromedianparafascicular nucleus as a prototype,were mostly symmetric. This group includes the medial, lateral,and inferior pulvinar nuclei. Thalamic zones that project discretelyto a few, clearly defined cortical receptor fields (using themedial geniculate nucleus [MG] as a prototype) closely reflectedthe asymmetry of the cortical fields to which they project.Hence, the MG showed a slight right-sided bias, and the lateralisposterior nucleus (related to the grossly asymmetric inferiorparietal lobule) showed a significant leftsided bias in eightof the nine brains measured. This asymmetry may partially explainthe apparent language specialization of the dominant thalamus.

Author Affiliations

From the Neurological Units of the Beth Israel Hospital (Drs Eidelberg and Galaburda) and Boston City Hospital (Dr Galaburda); Departments of Neurology, Harvard Medical School (Drs Eidelberg and Galaburda) and Boston University School of Medicine (Dr Galaburda); and the Dana Research Institute of the Beth Israel Hospital (Drs Eidelberg and Galaburda), Boston.

Footnotes

Accepted for publication Sept 10, 1981.

Reprint requests to Neurological Unit, Beth Israel Hospital,330 Brookline Ave, Boston, MA 02215 (Dr Galaburda).

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