The external opening of carotid canal is a roughly circular opening on the inferior surface of the petrous portion of the temporal bone by which the internal carotid artery enters the carotid canal.
【 語 句 】
・petrou portion of the temporal bone:側頭骨の錐体 ・internal carotid artery:内頚動脈 ・carotid canal:頚動脈管