The cells themselves are represented by 20% in number (about 350 million). The endocrine elements of the testes, Leydig cells, are found in the interstitium, which occupies approximately 10-15% of the testes and fills the area between the seminiferous tubules. ![]() These individually provide two main functions: spermatogenesis and steroidogenesis. The testes themselves are functionally and morphologically divided into two sections: intersticium and seed-forming canals. Testicle cover consists of 3 layers of membranes: tunica vaginalis, tunica albuginea and tunica vasculosa. They are stored in a scrotum, which on the one hand has the function of a protective cover and at the same time plays an important role in regulating the temperature, which should be 3–4 & nbsp ° C lower than the abdominal temperature. Testicles are an ellipsoid-shaped paired organ measuring between 3.6-5.5 cm in length and 2.1-3.2 cm in width. Testosterone is derived from progesteron, which is created by gradual modifications of the carbon skeleton of cholesterol (dehydrogenation, isomerization,…). ![]() One third of its production is provided by zona reticularis of adrenal gland (not testosterone but another androgen with a similar function is produced here – dehydroepiandrosterone, shortly DHEA). ![]() Testosterone, the most important representative of androgens, is a steroid hormone produced in men primarily by Leydig cells. Determines the development of the male phenotype, sexual organs, occurrence of secondary sexual characteristics, stimulates spermatogenesis (in men)
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