鼻咽顶壁与其周围重要结构的关系方程式

Relationship equations between the top of nasopharynx and the important structures around it

目的 :研究鼻咽顶壁与其周围重要结构的位置关系和关系方程式的方法 ,为临床分析鼻咽癌对这些结构的侵犯提供依据。方法 :32个颅骨标本 ,先测出各重要结构的三维空间坐标值 ,根据解析几何公式 ,列出其关系方程式。结果 :测出了各结构的三维坐标值。以鼻咽顶中心点 (咽顶点 )为原点计算出犁骨后缘点、咽结节点、卵圆孔左内缘点及右内缘点、颈静脉孔左内缘点及右内缘点的坐标值 ;左卵圆孔内缘点与通过犁骨后缘点且平行于X轴直线的距离 ,其方程式是 :l =(-2 3.11-x1) 2 + (6 .17-6 .37) 2 + (4.5 2 -3 .75 ) 2 ;右颈静脉孔内缘点与通过咽顶点水平高处咽右侧缘且平行于Y轴直线的距离 ,其方程式是 :l=(2 0 .5 3 -15 ) 2 + (-16 .48-y1) 2 + (0 .49-0 ) 2 。结论 :临床医生可根据鼻咽癌在鼻咽腔的中心或边缘位置点或线 ,以犁骨后缘和正中线作为位置参考点 ,通过平移X或Y坐标 ,根据公式推算其与有关结构的距离。

Objective:To provide anatomical basis for clinical analysis of the invasion of nasopharynx carcinoma to the top of nasopharynx and neighboring structures by studying the relationship of them.Methods: The three dimensional coordinate of these structures were measured on 10 adult skull specimens.The relationship equations of them were made out with analytic geometry.Results: When the central point of nasopharynx was set as the origin of the coordinate,calculated coordinates of those structures were as follow:the point of posterior margin of vomer(0,6.37,3.75);the point of pharyngeal tubercle(0,-6.37,-3.75);the point of medial margin of the oval foramen(left:-23.11,6.17,4.52;right:22.98,6.00,4.54);the point of medial margin of jugular forament(left:-20.42,-16.37,0.44;right:20.53,-16.48,0.49).The equation of the distance betwwen the point of medial margin of left oval foramen and the line through the point of posterior margin of vomer and parallel to X axis was l =(-23.11-x 1) 2+(6.17-6.37) 2+(4.52-3.75) 2,The equation of the distance between the point of medial margin of right jugular foramen and the line through right margin of pharynx and parallel to Y axis was l =(20.53-15) 2+(-16.48-y 1) 2+(0.49-0) 2.Conclusion: According to the equations,the distances between the nasopharynx carcinoma and related structures can be calculated out.