939. CONCERNING THOSE WHO CONSTITUTE THE PROVINCE OF THE MAMMILLARY PROCESSES OF THE BRAIN The mammillary processes are those processes which imbibe the phlegm of the interior or medullary substance of the brain through their interstices, and discharge it into the nostrils as phlegm, casting it out as altogether useless excrement, as is the mucus of the nose, for this mucus is not expended on the throat, for it would then conglutinate the foods and destroy the appetite.