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Olfactory asymmetry in the rat brain.

O Heine, A M Galaburda

    Experimental Neurology
    |February 1, 1986
    PubMed
    Summary

    The right olfactory bulb in rats is larger than the left, primarily due to a bigger outer layer. This asymmetry in olfactory bulb volume may relate to brain function.

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    Human cerebral cortex: localization, parcellation, and morphometry with magnetic resonance imaging.

    Journal of cognitive neuroscience·2013

    Area of Science:

    • Neuroscience
    • Comparative Anatomy
    • Olfactory System Research

    Background:

    • The olfactory bulb (OB) exhibits distinct cytoarchitecture and physiology.
    • Previous studies suggest potential hemispheric asymmetry in rodent brains.

    Purpose of the Study:

    • To investigate volumetric asymmetry between the left and right olfactory bulbs in albino rats.
    • To determine if asymmetry exists in the inner and outer strata of the olfactory bulb.

    Main Methods:

    • Quantitative analysis of olfactory bulb subdivisions.
    • Dissection and volume measurement of the inner and outer strata of both olfactory bulbs from 16 albino rats.

    Main Results:

    • Significant overall volume increase in the right olfactory bulb compared to the left.
    • The right outer stratum was significantly larger, accounting for the overall asymmetry.
    • No significant volume difference was observed between the left and right inner strata.

    Conclusions:

    • Evidence of a distinct volumetric asymmetry in the rat olfactory bulb, with the right hemisphere being larger.
    • The asymmetry is localized to the outer stratum of the olfactory bulb.
    • Findings suggest potential functional or developmental lateralization within the olfactory system.

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