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This may seem counterintuitive, as it inverts the normal relation between vision and radio.




 The relations of the sciatic nerve to the piriformis muscle in the Chinese wereinvestigated on 722 sides of the cadavers collected from four different regions of China.The normal relations of the sciatic nerve to the piriformis muscle is that the former liesunder the latter. This is the most frequent type, or type Ⅰ, observed in our collections(61.6±1.81%). Five types of variations have been observed but only one (type Ⅱ) ofthem, in which the common peroneal nerve passes through the piriformis muscle... The relations of the sciatic nerve to the piriformis muscle in the Chinese wereinvestigated on 722 sides of the cadavers collected from four different regions of China.The normal relations of the sciatic nerve to the piriformis muscle is that the former liesunder the latter. This is the most frequent type, or type Ⅰ, observed in our collections(61.6±1.81%). Five types of variations have been observed but only one (type Ⅱ) ofthem, in which the common peroneal nerve passes through the piriformis muscle occursmore frequently (34.9±1.78%) than the others. Region and side failed to show anystatistical importance in the percentage distribution of these types. Racial difference in the percentage of distribution of the various types between theChinese, Japanese and Whites has been compared. The difference between the Chineseand Japanese is 2.39 and that between the Chinese or Japanese and the Whites is 11.87(or 11.53) and is considered statistically significant.  本文统计分析了361具,722侧国人坐骨神经与梨状肌相互关系的调查纪录。根据坐骨神经本干或其分支之一,即胫神经或腓总神经,经梨状肌下缘、穿肌貭或经肌上缘出骨盆的不同情况得出六种类型,其中以坐骨神经本干经梨状肌下缘出骨盆的Ⅰ型居首位,作为正常型,占61.6±1.81％,以胫神经经梨状肌下缘腓总神经穿肌貭的Ⅱ型居次位,作为主要变异型,占34.9±1.78％,其它4种变异型都不常见,合计之只占3.4±0.67％。地区差及侧差均不显著。与日本人及欧美人同样调查作了比较,得出以下结果:日本人及欧美人亦都以Ⅰ型占首位Ⅱ型居次位,但日本人Ⅰ型的出现率(67.0±1.35％)与中国人同型的出现率无显著的差别(t值为2.39),而欧美人Ⅰ型的出现率(85.1±0.81％)则非常显著地高于中国人及日本人的出现率(t值为11.87及11.53)。一般教科书都认为坐骨神经在骨盆内高位分支与产生变异有关。本文从梨状肌的种系发育由有尾类侧群肌合并而成以及在个体发育中由两肌节的来源与坐骨神经高位分支相遇时相交叉的设想作了解释产生变异原因的尝试。  In this PaPer,a geometric model of the space of four dimensions is given in a regular tetrahedroid of three dimensions.This regular tetraliedron repre sents the coordinate system of 4 dimensions.The Positions of geometric elements in the model covesponding those in s_4. Can be defermined according to their characters or equations,and vice versa.It will be convenient to examine their velative positions in any projective space and in particular their parallel or normal relation ships are obviously clear.In... In this PaPer,a geometric model of the space of four dimensions is given in a regular tetrahedroid of three dimensions.This regular tetraliedron repre sents the coordinate system of 4 dimensions.The Positions of geometric elements in the model covesponding those in s_4. Can be defermined according to their characters or equations,and vice versa.It will be convenient to examine their velative positions in any projective space and in particular their parallel or normal relation ships are obviously clear.In addition,the geometric elements of particular positions have also been classified.  本文给出一个四维空间的几何模型,通过它可以直观地了解四维空间中的直线、平面和超平面关于投影空间的各种相对位置。  In this PaPer,a geometric model of the space of four dimensions is given in a regular tetrahedroid of three dimensions.This regular tetrahedron repre sents the coordinate system of 4 dimensions。The Positions of geometric elements in the model covesponding those in s_4. Can be defermined according to their characters or equations,and vice versa。It will be convenient to examine their relative positions in any projective space and in particular their parallel or normal relation ships are obviously clear,In... In this PaPer,a geometric model of the space of four dimensions is given in a regular tetrahedroid of three dimensions.This regular tetrahedron repre sents the coordinate system of 4 dimensions。The Positions of geometric elements in the model covesponding those in s_4. Can be defermined according to their characters or equations,and vice versa。It will be convenient to examine their relative positions in any projective space and in particular their parallel or normal relation ships are obviously clear,In addition,the geometric elements of particular positions have also been classified,  本文给出一个四维空间的几何模型,通过它可以直观地了解四维空间中的直线、平面和超平面关于投影空间的各种相对位置。   << 更多相关文摘 
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