auricular appendage

English Thesaurus

1. a pouch projecting from the top front of each atrium of the heart (noun.body)

hypernym	:	pocket, pouch,
definition	:	(anatomy) saclike structure in any of various animals (as a marsupial or gopher or pelican) (noun.body)

part meronym	:	atrium cordis, atrium of the heart,
definition	:	the upper chamber of each half of the heart (noun.body)