[Development of peritubular myoid cells in the rat testis].

In the testes of 47 embryos, fetuses and newborn rats (Fisher strain), until the 15th day of life, the appearance and numerical dynamics of "premyoid" and myoid cells were analysed by light microscopy. The material was prepared routinely (fixed in Bouin fluid, embedded in paraffin, and cut to the thickness of 7 micrometers). The embryos of the 12th to 17th day of gestation were serially sectioned in toto, while fetal testes on the 18th to 21th day of gestation were removed and serially cut as well as the rat testes after birth.

[Inhibins of the testis and ovary and their morphologic origin].

During the last decade and especially during the last several years the question of the inhibin presence in the gonads of both sexes has been in the focus of researcher's interests. According to what has been known up to date the inhibins are produced by Sertoli cells in the testis and by granulosa cells in the ovary. The inhibin activity is many-sided.

[Gonocytes in the fetal and early postnatal period (stereologic study)].

The behaviour of gonocytes from the 15th prenatal to the 6th postnatal day was studied in testicles of 32 Wistar rats. Histological and cytological methods were applied. Cytological smears were obtained by the imprint method.