Caption: Testosterone crystals. Testosterone is a steroid hormone from the androgen group. It is the principal male sex hormone and the "original" anabolic steroid. Like other steroid hormones testosterone is derived from cholesterol. The largest amounts of testosterone are produced by the testes, but it is also synthesized in smaller quantities by the theca cells of the ovaries, the zona reticulosa of the adrenal cortex, and the placenta. Substantial amounts of the testosterone in women are also produced from estradiol by reverse aromatization in the liver, adipose cells, and other peripheral tissues. In the testes testosterone is produced by the Leydig cells. Due to dual function of the male gonad, testosterone directly influences spermatogenesis. Like most hormones, testosterone is supplied to target tissues in the blood where much of it is transported bound to a specific plasma protein, sex hormone binding globulin (SHBG).
Magnification*: x40
Type: LM
Copyright 1985 Dennis Kunkel Microscopy, Inc.
Keywords: 890821-05,12.01.04,crystal,crystals,adrenal cortex,testosterone,testes,cholesterol,steroid hormone,male sex hormone,anabolic steroid,Leydig cell,Leydig cells,placenta,theca cells,spermatogenesis,sex hormone binding globulin,SHBG,zona reticulosa,LM