采用Grillo(1974)方法,甲醛-戊二醛固定心房组织4h,然后骤冷,恒冷箱切片,片厚24μm,在荧光显微镜下观察。将含有发荧光的小强荧光细胞的切片选出,修整后进行电镜包埋程序。在电镜下,小强荧光细胞呈椭圆形或不规则形。胞质内有大量膜被颗粒泡,依电子密度可分为低电子密度和高电子密度的两类。它们的线粒体丰富,高尔基复合体发达,粗面内质网多呈单个扁囊散布胞质。我 Using Grillo (1974) method, formaldehyde - glutaraldehyde fixed atrial tissue 4h, then quenched, constant cold box section, the thickness of 24μm, observed under a fluorescence microscope. Sections containing fluorescein small fluorescent cells were selected and trimmed for electron microscopy. Under electron microscope, small fluorescent cells were oval or irregular shape. There are a large number of cytoplasmic membrane vesicles, according to the electron density can be divided into two kinds of low electron density and high electron density. They are rich in mitochondria, developed a complex of Golgi, rough endoplasmic reticulum mostly single cyst scattered cytoplasm. I