✔ [ Ссылка ]
✔ [ Ссылка ]
✔ Ask questions here: [ Ссылка ]
Follow us:
▶ Facebook: [ Ссылка ]
▶ Review Us: [ Ссылка ]
• Hormonal mechanisms that influence male reproductive function involve endocrine tissues contained in the:
• Hypothalamus of the brain.
• Anterior pituitary.
• Testes.
• In the hypothalamus, certain neurosecretory cells secrete gonadotropin- releasing hormone (GnRH).
• GnRH is carried by the blood to the anterior pituitary, where it binds to receptors on gonadotrophs.
• GnRH then stimulates gonadotroph cells to increase secretion of two gonadotropic hormones:
• Lutenizing hormone (LH).
• Follicle-stimulating hormone (FSH).
• LH and FSH are transported in the blood to the testes from the anterior pituitary.
• LH and FSH both indirectly affect spermatogenesis.
• LH binds to receptors on Leydig (interstitial) cells between seminiferous tubules and stimulates the secretion of testosterone. • Under the influence of FSH and testosterone, Sertoli cells produce Androgen-binding protein (ABP) that binds and maintains high testosterone levels near the spermatogenic cells.
