how is the spermatogenesis in the testis inhibited by the brain testicular axis
Hypothalamic–pituitary–gonadal axis In males, the production of GnRH, LH, and FSH are similar, but the effects of these hormones are different.[8] FSH stimulates sustentacular cells to release androgen-binding protein, which promotes testosterone binding. LH binds to the interstitial cells, causing them to secrete testosterone. Testosterone is required for normal spermatogenesis and inhibits the hypothalamus. Inhibin is produced by the spermatogenic cells, which, also through inactivating activin, inhibits the hypothalamus. After puberty these hormones levels remain relatively constant.