[Development of ovaries in bovine fetuses].

The growth of ovaries, development of germ cells, formation of sex cords, folliculogenesis and dependence of these processes on the gonad morphogenesis stages were studied on 68 embryos and foetuses at the age of 1.5 to 9 months. Sex differentiation of ovaries was shown to take place in 1.

[Chronology and dynamics of the development of female genital organs of cattle fetuses].

The chronology and dynamics of the female germ cell development, of the mitotic activity of oogonia, and of the chromosome rearrangements at prophase I of meiosis have been quantitatively estimated in 30 cow embryos and foetuses at the age of 1.5 to 9 months. The sexual differentiation of the gonads was shown in a 1.

[Dynamics of the growth and maturation of oocytes and follicles in the ovaries of the cow].

Chromosome despiralization and nucleolus vacuolization have been studied during the oocyte intensive growth. Oocyte and nucleolus growth has been found to stop at the secondary antral follicles with the diameter more than 1000 mkm. Chromosomal and nucleolar activity decreases at this stage.

[Ultrastructure of axosomatic contacts on sensomotor cortex neurons and celiac ganglia in rats in relation to age].

Axosomatic contacts of pyramidal neurons and those of neurones of celiac ganglia in rats are characterized by diverse types of relationships and by many-component complexes. The metric parameters of axosomatic contacts of pyramidal neurons do not change with age but the proportion of active contacts increases. With age, the celiac ganglia show an increase in the diameter of contact axons and in the number of deeply invaginated contacts.