To observe the anatomical structures of tricuspid complex of different-month fetal hearts in order to accumulate data for heart study and clinical utilization.
目的观测不同胎龄胎心三尖瓣复合体的形态结构，为心脏研究和临床应用积累资料。
2
Conclusion the various kinds of structures of tricuspid complex of the fetal hearts are growing with the increase of the fetal ages.
结论胎心三尖瓣复合体的各结构随着胎龄的增长而增长。
3
The application of three-dimensional ultrasound can clearly show fetal anatomic structures, providing a new way for prenatal diagnosis.