What do arrows A and B point to? image Human skull lateral view with arrow A pointing to a large structure posterior to tympanic region and arrow B pointing to an opening on the side of skull. Question 15 options: 1) a)petrous process b) internal auditory meatus 2) a)mastoid process b) external auditory meatus 3) a)spinous process b) foramen auditory 4) a)coronoid process b) optic canal