颅后窝的应用测量研究

AN APPLIED MORPHOMETRIC STUDY OF THE POSTERIOR CRANIAL FOSSA

作者以人类学骨骼测量法测量了100具成人的颅后窝。依左、右侧横沟上缘所在平面的高低,先分颅后窝为左高型、等高型及右高型,然后分型测量颅后窝左、右半侧的深径、矢状径、横径和骨结构间径,共计20项。各矢状径分别代表半侧颅后窝外侧、中间和内侧1/3份的前后距离,各横径相当于半侧颅后离前、中、后1/3份的横向距离。本研究提供了颅后窝窝径和骨结构间径的正常值。

A morphometric study of the posterior cranial fossa was made in a series of 100 Chinese adult cranial bases at random. According to the level of the superior margin of the transverse sulcus ok two halves of the fossa, three types of posterior cranial fossa were classified, that is, the left high type, the equal high type, and the right high type. Variables studied, 20 in sum, including the depth, the sagittal and transverse measurements, and distances between the endocranially situated osseous points about the fossa. Each sagittal measurement represents approximately the antero-posterior distance of the medial, middle, and lateral thirds of that half of the fossa respectively, and each transverse measurement represents almost the width of the anterior, middle, and posterior thirds respectively.Statistical analysis revealed that most of the metric valuts on the right half of the fossa are greater than that of the left one, and the side difference of S1 and S2 measurements between two halves is highly significant. Secondly, the mean values of all transverse measures of the left half are greater in the total sample, and T3 measurement is even greater in each type of the fossa. Thirdly, the differences of all measures between the types mentioned above are mostly none significant. From these results, it is reasonable to conclude that asymmetry, between two halves of the posterior cranial fossa does exist virtually, and, in general, the right half of the fossa is the larger