关键词: 人蛲虫卵, 扫描电镜观察, 不对称, 对称形, 鼠管状线虫, 卵壳表面, 长椭球体, 长椭圆形, 玻片标本, 医学寄生虫学

Abstract: Spontaneously deposited eggs of E. vermicularis were suspended in 1:3 egg white mucilage and mounted on slides previously fixed with wax paper frame to avoid pressure of the coverslide and to give space to eggs deposited in any position. The variation of the contour of the egg shell at various planes was observed and a stereoscopic configuration of egg shell obtained.The egg-shell of E. vermicularis is asymmetrically ellipsoid. A pair of longitudinal ridges run parallelly over the convex or dorsal side of the shell. Scanning electron microscopy showed the presence of numerous minute pores distributed unequally over the shell surface and a foveola with an uneven base situated on the dorsal ridges. It is considered to be the hatching pore of the egg. The reason why eggs can present both asymmetric and symmetric contours is discussed.