Gonadal function
Male gonadal function
The testes secrete testosterone and manufacture spermatozoa. Before puberty, gonadotrophin and testosterone concentrations in plasma are very low. The development of the Leydig cells and their secretion of testosterone is influenced by LH, whereas Sertoli cell function is influenced by FSH (Fig 50.1). Testosterone is responsible for the development of the male secondary sex characteristics such as hair growth, deep voice and characteristic musculature.