part of part of has part has part organ middle ear pharyngotympanic tube AAO:0011016 pharyngo-tympanic tube AAO:0000146 UBERON:0002393 tuba auditiva tuba pharyngotympanica FMA:9705 Wikipedia:Eustachian_tube tuba auditoria GAID:869 tuba auditiva; tuba auditoria; tuba auditivea EMAPA:17601 VHOG:0001145 XAO:0000213 Organ with organ cavity which connects the cavity of the middle ear to the cavity of the pharynx. Examples: There are only two pharyngotympanic tubes, the right and the left pharyngotympanic tubes.[FMA]. MA:0000255 NCIT:C12500 EV:0100359 eustachian tube internal auditory tube EDITOR_NOTE we follow FMA in making this an organ, but include a separate class for the part that is epithelium, which is equivalent to the EHDAA2 structure. From this we infer the developmental relationship auditory tube pharyngotympanic tube epithelium