No arguement with Grant, but there may be some confusion here.
The parotid gland is a saliva producing gland, with a duct into the mouth that cn be inflated with air. THis is not physiological!
The Eustachian tubes are ducts that communciate between the mouth and the middle ear, to equalise the pressure either side of the ear drum. Many will have experience dth effetc of going up or down a few hundred feet, then swallowing to akek their ears 'pop', as the air pressure equalises.
And Dizzie Gillespie merely (merely!!) had cheeks, in which the buccinator muscles lost tone, so that they easily over inflated due to the high pressure exrted by a tiop trumpeter. Nothing to do with saliva or ears! See:
http://books.google.co.uk/books?id=D...um=4&ct=result
Gillespie even used this 'disaility' by becoming a master of "circular breathing", to play longer breaks than he could on one breath. See:
http://www.experiencefestival.com/circular_breathing