Male reproductive function is regulated by a highly coordinated neuroendocrine system involving the hypothalamus, pituitary gland, and testes. This system, known as the hypothalamic–pituitary–gonadal (HPG) axis, ensures the proper erotic production of sperm and male sex hormones.
Gonadotropin-releasing hormone (GnRH) is secreted in a pulsatile manner by the hypothalamus, stimulating the pituitary to release luteinizing hormone (LH) and follicle-stimulating hormone (FSH). LH promotes testosterone synthesis in Leydig cells, while FSH supports Sertoli cell function and spermatogenesis.
Disruption of this axis may result from chronic stress, systemic illness, obesity, endocrine disorders, or central nervous system pathology. Such disturbances can lead to hypogonadotropic hypogonadism, reduced sperm production, and sexual dysfunction.
Understanding neuroendocrine regulation is fundamental in andrology, as it forms the basis for both diagnostic evaluation and hormonal treatment strategies.
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