[Characteristics of morphogenesis of rudimentary rat gonads transplanted into the testis].

The rat embryo (13 and 15 days of development) gonad germs of both sex, as well as isolated primary germ cells (PGC) have been transplanted into testes of mature animals of the same strain and investigated for 1.5 years. The isolated PGC are not able for further development and subjected to reduction. The gonad germs form analogues of the gonads with formation of definitive gonadal cells in 30 days. Further, degeneration of mature gonadal cells takes place. For realization of PGC ++cyto-differential processes and their stage-to-stage transformation into mature gametes certain interactions are necessary with concrete surrounding tissues that are at a strictly synchronized (with germ cells) stages of development.