猕猴长骨的不对称性研究

观察了太行山猕猴肱骨、股骨、第二掌骨和第二蹠骨4种长骨有关变量的不对称性特征.肱骨标本55例,股骨标本53例,掌(蹠)骨标本34例.选择变量5个,分别是4种长骨的最大长、中间宽、中间高、中间周长和中间横截面积.用SPSS13.0软件进行正态分布检验和不对称的性差比较.结果表明:左侧肱骨的方向性不对称值大于右侧,显示出方向性不对称.第二掌骨比较结果显示是右侧大于左侧,下肢股骨和第二蹠骨作为对照组不对称性表现较弱.表明上肢骨出现的方向性不对称并不是由于波动性不对称随机产生的.结果提示太行山猕猴上肢长骨的功能可能呈侧面化趋势,在各种长骨之间力量与精密控制之间存在一种互补关系.

Bilateral Asymmetry in the Limb Bones of the Macaque

This paper is to survey bilateral asymmetry of adult macaque(Macaca mulutta) using the humerus,femur 2nd metacarpal and 2nd metatarsal.Osteological materials are obtained from 55 adult individuals from the Taihang mountians,including 55 humerus,53 femurs 34 metacarpals and 34 meta metatarsals.Four linear measurements,including the maximum length in the limb bones,dorsoventral diameter,mediolateral diameter,and circumference,are measured at mid-shaft and the midshaft cross-sectional area in these limb bones are calculated using the formula for an ellipse.Lilliefors tests and independent-samples tests adopting SPSS 13.0 for windows are used to determine the normality and compare sex differences of asymmetry.Results indicate that the bilateral asymmetry values of the left humeri are signicantly greater than the right,indicating directional asymmetry.The right 2nd metacarpals show a tendency toward greater area than did the left.The lack of asymmetry in 2nd metatarsal and femur and serves as a lower limb control,and suggests that the upper limb results are not a product of fluctuating asymmetry.These findings imply behavioral laterality in upper limb function in Macaca mulutta,and suggest a complementary relationship between precision and power for two sides.