Sea Star Water Vascular System

The water vascular system starts with the Madreporite, where water enters the body. The water is then funneled into the starfish's core through the Stone canal, which then flows into the Ring canal. The ring canal distributes water around the center of the organism, where it then enters one of the radial canals. The radial canals take the water from the center of the creature all the way down the arms, into the ampulla, where it can then be used for locomotion, by hydraulically moving the tube feet, and assist in feeding (also with tube feet).