part of part of pharyngotympanic tube bone tissue head connective tissue bony part of pharyngotympanic tube http://upload.wikimedia.org/wikipedia/commons/9/9d/Gray911.png pars ossea (tuba auditoria) Wikipedia:Bony_part_of_pharyngotympanic_tube pars ossea (tuba auditiva) osseous portion of eustachian tube FMA:60057 bony part of eustachian tube SCTID:362563007 UBERON:0007355 The bony part of pharyngotympanic tube is about 12 mm. in length. It begins in the carotid wall of the tympanic cavity, below the septum canalis musculotubarii, and, gradually narrowing, ends at the angle of junction of the squama and the petrous portion of the temporal bone, its extremity presenting a jagged margin which serves for the attachment of the cartilaginous portion. osseous portion pars ossea tubae auditivae bony part of auditory tube