Asterias many times enlarged in SOMSO-Plast®. After Christian Groß Head of Biology Department (retired). The model shows in detail: 1. Complete arm with normal position of the organs (stomach intestinal caeca pyloric caeca ampullae). 2. Arm with ampullae ring canal Polian vesicles. 3. Skeleton of the arm with nervous system (nervering and radial nerves). 4. Arm in transverse section (ambulacral system in cross-section). The cut surface shows the stomach stone canal axial organ and madreporite. In addition on the outside the podia pedicellariae and optic organs are shown. Comprises 3 parts. On a removable stand and green base.