描述

The posterior semicircular canal (canalis semicircularis posterior) is vertical and directed backward, nearly parallel to the posterior surface of the petrous bone; it is the longest of the three semicircular canals, measuring from 18 to 22 mm.; its lower end is ampullated (Posterior bony ampulla) and opens into the lower and back part of the vestibule, its upper into the crus commune with the anterior semicircular canal.


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