顶骨凹陷变薄的形态学研究

本文从1480个颅骨中发现顶骨凹陷变薄的有16例。对其性别、年龄、颅形以及凹陷的形状、深度和骨质厚度作了观测,利用骨磨片和X线摄片对凹陷部分骨质进行了研究。结果表明此种凹陷均见于老年人,多数为双侧性。凹陷是由外板内凹而成,不涉及周围组织。X线侧位片显示凹陷处有宽带状低密度阴影。骨组织磨片显示在骨改建过程中,出现未满围骨单位增多,骨陷窝闭塞,造成局部的骨萎缩。

STUDY ON THE DEPRESSION AND THINNING IN PARIETAL BONE

This paper presents 16 cases of calvaria with depression and thinning in parietal bones among 1480 adult skulls. The items investigated are the form and depth of the depression as well as the sex, age and form of skulls. Besides, roentgenologic and histologic methods were also used in this study. All depressions were found in the skulls of aged, and most of them occurred bilaterally and appeared as the thinning of outer lamina and diploe of calvarium without involvement of surrounding tissues. In the lateral radiogram, the depression showed as a wide-band and low-density opacity. The bone section in this region demonstrated increment of incompletely closed osteons and also the occulusion of lacunae which probably led to bone atrophy.