Pituitary gland is called the master gland. It controls the secretion of the sex hormones. The pituitary also secretes other hormones which help in the maturation of ova in the ovaries and formation of sperm in the testes.The pituitary stimulates the testes and ovaries to produce sex hormones i.e. testosterone and estrogen. The sex hormones initiates the changes that occur in puberty in humans.