Why the Brain Stays Cool During Exercise and Why Moving the Head Affects Breathing and Drooling.

Some closely placed structures of the horse's head are shown here. Guttural pouches are air-filled extensions of the auditory tubes that appear to "puff pad" some of parts of the viscera of the head from harsh contact with bony structures of skull and hyoid apparatus. A recent study of pouch position with respect to the carotid artery blood supply of the brain offers evidence that they keep the brain from overheating during exercise. Only the right guttural pouch is shown below.

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