方叶长轴斜断面后三角形顶点有16.2%不落在方叶后区上(凹陷型占8.1%;隆起型占2.7%;平坦型占5.4%);

• while 16.2%25 of apical angles of the post triangle in quadrate lobe section are beyond quadrate lobe postzone(of which 8.1%25 belong to introcession type,2.7%25 eminence type,5.4%25 evenness type).