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Medical Definition of Guttural pouch
1. A structure in the horse which is a diverticulum of the auditory (eustachian) tube; subject to chronic infections and inflammation and frequently necessitating surgery for relief. Hartmann's pouch, a spheroid or conical pouch at the junction of the neck of the gallbladder and the cystic duct. Synonym: ampulla of gallbladder, fossa provesicalis, pelvis of gallbladder. Heidenhain pouch, a small sac or pouch of the stomach, vagally denervated and closed off from the main cavity but with an opening through the abdominal wall, fashioned for the purpose of obtaining gastric juice and for studying gastric secretion in physiologic experiments. (05 Mar 2000)