目前,已经确认大白鼠成熟卵泡膜外层存在平滑肌细胞。但对于其来源尚待研究,本文就此进行探讨。材料与方法未成年雌性大白鼠20只,体重70～80g,每只皮下注射孕马血清促性腺激素(PMSG)50单位,50小时后处死。取出卵巢用3%戊二醛预固定,1%锇酸后固定,6.8环氧树脂包埋,LKB 超薄切片机切片,JEM—7型电子显微镜观察拍照。 At present, it has been confirmed that smooth muscle cells exist in the outer layer of the mature rat’s follicle. However, the research on its source remains to be studied. MATERIALS AND METHODS Twenty females, weighing 70-80 g, were injected subcutaneously with 50 units of pregnant mare serum human gonadotropin (PMSG) subcutaneously. The animals were sacrificed 50 hours later. The ovaries were pre-fixed with 3% glutaraldehyde, fixed with 1% osmium tetroxide, embedded in epoxy resin, sliced ​​by LKB ultrathin microtome and photographed under JEM-7 electron microscope.