Structures that may lie along its central structure include Tiedemann's bodies, believed to produce immune cells known as coelomocytes, and Polian vesicles, which are lacking in crinoids.
Structures that may lie along its central structure include Tiedemann's bodies, believed to produce immune cells known as coelomocytes, and Polian vesicles, which are lacking in crinoids. That central structure is also linked to the stone canal, which itself is connected to the madreporite, the entry point into this system. Branching off the central ring canal are usually five ambulacra, which themselves branch into terminal structures containing an ampulla and a muscular podium. Providing a system for locomotion, circulation, and respiration in a phylum of deuterostomes, FTP identify this system that provides fluid to tube feet and that is unique to echinoderms.
Structures that may lie along its central structure include Tiedemann's bodies, believed to produce immune cells known as coelomocytes, and Polian vesicles, which are lacking in crinoids.
{water vascular} system