A function for guttural pouches in the horse

Keith E. Baptiste (), Jonathan M. Naylor, Jeremy Bailey, Ernest M. Barber, Klass Post and Jim Thornhill
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Keith E. Baptiste: University of Saskatchewan
Jonathan M. Naylor: University of Saskatchewan
Jeremy Bailey: Radiology and Surgery, University of Saskatchewan
Ernest M. Barber: University of Saskatchewan
Klass Post: University of Saskatchewan
Jim Thornhill: University of Saskatchewan

Nature, 2000, vol. 403, issue 6768, 382-383

Abstract: Abstract Athletic animals must keep their brains cool during exertion because this organ can be damaged irreversibly by hyperthermia. But how horses do this has remained a mystery, as they don't appear to have thermoregulatory dervices like those found in other animals. They do, however, have a unique anatomical arrangement of their internal carotid arteries, which supply blood to the brain: these are enveloped by a pair of air-filled guttural pouches. Here we show that horses use their guttural pouches to cool these important arteries during exercise, keeping the brain from overheating.

Date: 2000
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DOI: 10.1038/35000284

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