胎儿心室条索的类型和超微结构

Types and ultrastructures of ventricular cords of fetal heart

目的:研究胎儿心室条索的类型和超微结构。方法:应用解剖学、组织学和透射电子显微镜技术,观察胎儿心室条索的类型及超微结构。结果:左、右心室均存在心室条索,出现率分别为88.89%和85.19%;心室条索分为肌型、传导型、混合型和腱型4种类型,肌型由普通心肌细胞构成;传导型含有Purkinje细胞、移行细胞和少量的P细胞;混合型含心肌细胞和少量P细胞;腱型由结缔组织构成。结论:心室条索是左、右心室的正常结构,部分心室条索是心室传导通路的一部分;不同类型的心室条索组织结构存在差异,可能与其功能不同有关。

Objective： To investigate the types and ultrastructures of the ventricular cords of the fetal heart. Methods： Ultrastructures of ventricular cords of fetal heart was observed and compared by anatomical and histological techniques, and scanning electron microscopy. Results： Cords could be found both in the left and right ventricles. The frequency of the ventricular cords in the left and right ventricles was respectively 88. 89% and 85. 19% The false tendon were classified into four types： muscular, conductive, mixing and tendinous. The muscular cords were composed of eardiomyocytes. The conductive cords contained Purkinje cells, T cells and a few P cells. The mixing cords consisted of cardiomyocytes and a few P cells. The tendinous cords were tight connective tissue. Conclusion： Ventricular cords are nomal strutures in the left and right ventricules. Some ventrieular cords are the part of the conductive path. The differences of ultrastructures in different cords could be related to their functions.