Hentona H, Okubo J, Tanaka H, Tatsumi T, Komatsuzaki A
Department of Otorhinolaryngology, School of Medicine, Tokyo Medical and Dental University.
Nihon Jibiinkoka Gakkai Kaiho. 1995 Aug;98(8):1278-84. doi: 10.3950/jibiinkoka.98.1278.
Pneumatized air cells of the temporal bone are embryologically divided into two portions; the squamosal portion and the petrosal portion. These two portions are anatomically separated by the petrosquamous fissure and petrosquamous lamina, the so-called Körner's septum. In this study, the volumes of the two portions were measured with Target Imaging CT in 5 normal ears (3 subjects) with a clearly recognizable Körner's septum. The combined volume of the two portions, in all CT slices, was also measured. The squamosal portion occupied 32.7% of the total air cell volume, on average, and the petrosal portion was 67.3%. A positive correlation was observed between the total air cell volume of the temporal bone and the volume ratio of the petrosal portion. When the volume of each part was examined according to the CT slice level, from high to low, the maximum volume of the squamosal portion was at the slice level of the epitympanic cavity. The volume of the petrosal portion was prominent at the slice level of the epitympanic cavity and the upper antrum. These results that the petrosal portion plays a more important role than the squamosal portion in pneumatization of the temporal bone. This analysis with Target Imaging CT provides useful information for understanding the middle ear pathology resulting from poor pneumatization of the temporal bone.
鳞部和岩部。这两部分在解剖学上被岩鳞裂和岩鳞板（即所谓的克纳氏隔）分隔开。在本研究中，使用靶向成像CT对5只正常耳朵（3名受试者）的这两部分体积进行了测量，这些耳朵的克纳氏隔清晰可辨。还测量了所有CT切片中这两部分的总体积。鳞部平均占气房总体积的32.7%，岩部占67.3%。观察到颞骨气房总体积与岩部体积比之间存在正相关。当根据CT切片水平从高到低检查各部分体积时，鳞部的最大体积出现在上鼓室层面。岩部的体积在上鼓室和上颌窦层面较为突出。这些结果表明，在颞骨气化过程中，岩部比鳞部发挥着更重要的作用。这种靶向成像CT分析为理解颞骨气化不良导致的中耳病理提供了有用信息。
