Assertion: temporal bone's portion | /r/MadeOf | ossicular chain
Facets:
Source sentences:
text: The middle ear is an air-filled cavity within the petrous portion of the temporal bone that contains the ossicular chain and is bounded by the tympanic membrane laterally, the inner ear structures (surrounded by the otic capsule and the cochlear promontory) medially, the tegmen tympani superiorly, and the jugular wall (floor) inferiorly (Fig 5).