HISTOGENESIS IN THE EPIDIDYMIS OF DOMESTIC YAK IN PRENATAL PERIOD OF DEVELOPMENT
The paper presents the results of the stages of histogenesis in the epididymis of domestic yak in the fetal period of development. It has been found that fetuses of 2 months age had the formation of epididymis, and fetuses of 3 months age efferent tubules and ducts are not differentiated. At the age of 4 months the epididymis is enclosed in the connective appendage of the shell with clearly visible tubules and efferent ducts. Epithelium is of the efferent ducts and duct columnar. By 5 months the fetuses have the lumen of the duct of the same diameter in the head and tail of the epididymis, which is somewhat less in the body of the epididymis, and the epithelium and the height of the largest part in the body of the epididymis is the lowest in the tail of the epididymis.