posterior semicircular canal
/pɒstˈiəɹiə sˌɛmɪsˈɜːkjʊlə kənˈal/
n
English · posterior semicircular canal中文 · 后骨半规管Español · conducto semicircular posteriorFrançais · canal semi-circulaire postérieur
意味：Vertical canal parallel to the temporal bone; it monitors head movements to ensure that equilibrium is maintained.