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Prosencephalic asymmetries in Lemuridae.

M C de Lacoste¹, D S Horvath, D J Woodward

¹Department of Cell Biology & Anatomy, University of Texas Health Science Center, Dallas.

Brain, Behavior and Evolution

|January 1, 1988

Summary

Brain size and folding complexity do not influence regional volumetric asymmetries in lemurs. However, significant asymmetries in retrocalcarine cortex suggest early primate evolution of these brain patterns.

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Area of Science:

Neuroscience
Comparative Anatomy
Primate Evolution

Background:

Regional volumetric asymmetries are observed in primate brains.
The relationship between these asymmetries, brain size, and cortical folding complexity remains unclear.

Purpose of the Study:

To investigate if regional brain asymmetries in lemurs correlate with sulcal complexity or overall brain size.
To determine the evolutionary origins of striate and extrastriate asymmetries.

Main Methods:

Digitization of coronal brain sections from six Lemuridae species.
Integration of regional brain volumes and calculation of asymmetry indices.

Main Results:

The retrocalcarine cortex exhibited the most significant volumetric asymmetries.
No correlation was found between the degree of regional asymmetry and sulcal complexity or brain size.

Conclusions:

Striate and extrastriate asymmetries likely emerged early in primate evolution.
Brain size and sulcal complexity do not appear to be primary drivers of regional volumetric asymmetries in this primate group.

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