a mass of tissue arising from the primordial germ cells and within which the spermatozoa or ova are formed, the sex glands, which are the testicles in the male and the ovaries in the female. They determine secondary sex characteristics such as growth of the breasts, beginning of menstruation, growth of the , gonaad - elund, milles kujunevad loomade sugurakud, sugunääre - sugurakke valmistav nääre, sugunääre - munasari, munand