In 1920, Hirose demonstrated the luteinising effect of placental tissue and one year later, Evans and Long described luteinised ovaries in rats treated with hypophysial extracts. In 1926, Zondek and Aschheim as well as Smith, independently of each other, showed that a gonad-stimulating hormone was secreted by the adenohypophysis. In 1927, Aschheim and Zondek found their "Prolan" in human pregnancy urine and the first reliable pregnancy test was available. In the following years it could be demonstrated that the gonadotropic hormones from pituitary and from pregnancy urin were not of identical...

Atrophy of gonadotrophin producing cells Exogenously LH synthesis administered androgens and release or anabolic steroids are decreased Prostate Testes Normal function. Testosterone synthesis in The deficit of endogenously Leydig cells is decreased. The synthesized testosterone is exogenously administered compensated for by the steroid is not able to exogenously administered compensate for the deficit of steroid endogenously synthesized testosterone Figure 2 Intratesticular and serum testosterone concentrations after treatment with andro- gens or anabolic steroids in order to substitute for...