Development of oesophageal tissue structures in human embryogenesis.

The authors investigated human embryos and fetuses of 4 to 40 weeks old, their evolution and oesophageal histodifferentiation characteristics. The terms used to describe oesophageal tissue structure formation are defined more accurately. A detailed analysis of the sequence of oesophageal histogenesis processes is given, special attention being paid to the development of muscle element evolution in different oesophagus sections.