利用光镜对22例胎儿心脏的中心纤维体进行了组织学(12例)和组织化学(10例)观察.结果如下:(1)胎儿中心纤维体为致密结缔组织.在中央部成纤维细胞和基质较多,而纤维细胞和胶原纤维少,后二者主要分布于周边部.中心纤维体内有较多的小血管和大小不等的结细胞岛.结果表明:胎儿中心纤维体是一种不成熟的组织,正处于迅速发育阶段.(2)房室束恒定的穿经中心纤维体.(3)在中心纤维体内碱性磷酸酶和酸性磷酸酶为阴性反应,5’-核苷酸酶,乳酸脱氢酶和糖原为弱阳性反应. Histological (12 cases) and histochemistry (10 cases) of 22 cases of fetal heart fibrosis were observed under light microscope.The results were as follows: (1) Fetal central fibrous body was dense connective tissue.At the middle part of fibroblasts And matrix more, and fibroblasts and collagen fibers less, the latter two mainly in the peripheral part of the central fiber body has more small blood vessels and size of island cells of different sizes.The results show that: fetal fibroids is a Immature tissue, is in the rapid development stage. (2) atrioventricular bundle constant through the central fibrous body. (3) in the central fiber body alkaline phosphatase and acid phosphatase-negative reaction, 5’-nucleotide Enzymes, lactate dehydrogenase and glycogen are weak positive reactions.