Annotated axial CT of the right petrous temporal bone:
- blue arrow: otic capsule (dense bone)
- yellow arrow: petrous apex
- orange arrow: mastoid air cells
- red arrow: cochlea
- green arrow: vestibule
Original case courtesy of Dr David van Gelderen, Radiopaedia.org, rID: 37030. Original file: http://radiopaedia.org/cases/normal-petrous-temporal-bone-axial-ct. Annotations: crop and arrows.