It is suggestive of a pouch, if the patient regurgitates food materials which can be identified as having been swallowed several days before, currants perhaps being those most easily recognised and remembered.
"Manual of Surgery Volume Second: Extremities--Head--Neck. Sixth Edition."
Alexander Miles Alexis Thomson
The individual thus requested never refuses; it sets apart its mandibles, takes a proper position, and regurgitates a drop of transparent fluid which is licked up by the hungry ant.
"Mutual Aid A Factor of Evolution"
kniaz' Petr Alekseevich Kropotkin