Schulter-Ellis F P
Acta Otolaryngol. 1979 May-Jun;87(5-6):461-5. doi: 10.3109/00016487909126452.
Adult crania from four human skeletal population samples were radiographed in order to study variation of the air cell system in the mastoid process. Six types of processes were recognized, i.e., sclerotic, diploic, diplo-pneumatic, pneumatic, and highly pneumatic. Frequency of non-pneumatized (acellular) processes in Eskimos was significantly lower than that found in the other three populations. Female crania in each sample showed fewer acellular processes than male, but the differences were statistically significant only in the Whites, Eskimos, and total sex samples. While present in each population, frequency of asymmetry of type was significant in only Whites and Eskimos. These results provide some additional evidence that a genetic factor is operant in determining the degree of cellularity of mastoid processes.
为了研究乳突气房系统的变异情况，对来自四个人类骨骼群体样本的成人颅骨进行了X射线摄影。识别出六种类型的乳突，即硬化型、板障型、板障-含气型、含气型和高度含气型。爱斯基摩人非气化（无气房）乳突的频率显著低于其他三个人群。每个样本中的女性颅骨无气房乳突比男性少，但差异仅在白人、爱斯基摩人和总体性别样本中具有统计学意义。虽然每种人群中都存在类型不对称的情况，但仅在白人和爱斯基摩人中，类型不对称的频率具有显著性。这些结果提供了一些额外的证据，表明遗传因素在决定乳突气房化程度方面起作用。
