OBSERVATION OF HISTOLOGY OF THE DEVELOPMENT OF THE TRACHEA IN HUMAN FETUSES
Huang Kanghua(Dept. of Biology. South China Normal University, Guangzhou 510631,China)
Tracheas were taken from human fetuses at fetal age of 4 to 10 months and crosscut into sections, H. E. stained. Watched under the microscope, the development of the epithelial of mucous membrane, the hyaline cartilage and the acinus showed as follows:1. The epithelial of mucous membrane at fetal age of 4 to 6 months were simple ciliated colummar epithelium; at 8 to 10 months were pseudostratified ciliated colummar epithelium.2. The size of the cartilage cell increased with the fetuse development. The cross section increased rapidly. The cells decreased gradually in density. The amount of the acinus increased, too. The above changes were rapid at 7 to 8 months.
【CateGory Index】： R329.1