EN
The aim of the study was to use an electron microscope to determine when the appropriate structures of mature nerve and glial cells in bovine hippocampus gyrus dentate start to appear during fetal life and how this development occurs in different age groups. Samples for examination under electron microscopes were taken from fetal brains at 16, 18, 20, 23 and 29 weeks of life. The ultrastructure development during the different periods of development was described and the outcome produced as electronograms. The results of the study indicate that the ultrastructural development of neurons and glial cells of the studied regions ends in the last trimester of pregnancy.