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Comparative aspects of the area postrema: fine-structural considerations help to determine its function

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Summary

  1. 1.

    The area postrema is a circumventricular organ of the fourth ventricle of the mammalian brain. Although there are distinct gross anatomical differences in the appearance of this organ between “lower” mammals such as rodents and lagomorphs and “higher” mammals such as carnivores and primates, its fine structure is remarkably similar in all species studied.

  2. 2.

    There are many suggestions in the literature for a specific function for this area of the brain, ranging from its being a chemoreceptive trigger zone for the emetic response to its being a regulatory nucleus for the sleep cycle. The present report describes some comparative studies on the ultrastructure of this organ.

  3. 3.

    This information is discussed in relation to what is known about the neurochemistry of the area postrema and its connections with other brain regions and visceral structures. A suggestion is offered that our current knowledge of the area postrema is consistent with its performing many of its proposed functions in the context of a regulatory (“fine-tuning”) center for many autonomic functions.

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  1. Department of Anatomy, Dalhousie University Medical School, B3H 4H7, Halifax, Nova Scotia, Canada

    R. A. Leslie

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Leslie, R.A. Comparative aspects of the area postrema: fine-structural considerations help to determine its function. Cell Mol Neurobiol 6, 95–120 (1986). https://doi.org/10.1007/BF00711065

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