Methods: The observations were made on 93 sides of dry skulls or temporal bones. The mastoid foramina and canals in the mastoid part were measured statistically for their presence 、 locstion 、 diameter and length with the vernier calliper. 方法:采用游标卡尺等测量、统计93侧干性颅(颞)骨乳突孔及乳突管(道)的出现率、位置、内径和长度。