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Copyright ©2010 Baishideng.
World J Gastrointest Pathophysiol. Jun 15, 2010; 1(2): 50-62
Published online Jun 15, 2010. doi: 10.4291/wjgp.v1.i2.50
Figure 4
Figure 4 Scheme of hypothalamic-pituitary-gonadal (HPG) axis control exerted by both circulating and in situ locally produced estradiol in men. This axis controls development, reproduction, and aging in animals. The hypothalamus produces gonadotropin-releasing hormone (GnRH). The pituitary gland produces luteinizing hormone (LH) and follicle-stimulating hormone (FSH), and the gonads produce estrogen, progesterone and testosterone from different kinds of cells.