The main female reproductive parts are the carpels, which are fused together in most flowers to form a pistil. The pistil is usually found in the center of the flower, and is essentially a home for the ovules, or eggs. A pistil has three parts: a sticky part at the top called a stigma, the thin tube leading downward called a style, and the sac at the bottom called an ovary. When the pollen, which is the male gamete (corresponding to sperm in animals), reaches the pistil, it often becomes stuck to the stigma. The pollen then travels down the style into the ovary, where it meets with the ovules and fertilizes them. The diagram is shown below: