• Central Disc: The center of the starfish, also known as the central disc, is where the organs are located.
• Arms: The five arms of the starfish extend outward from the central disc and contain rows of tube feet, which the starfish uses for movement and capturing prey.
• Ambulacral Grooves: These grooves run down the underside of each arm of the starfish and are lined with tube feet.
• Madreporite: The madreporite is a small, porous plate located on the top of the central disc. It functions as the entrance for water into the water vascular system.
• Oral Surface: The underside of the starfish, known as the oral surface, contains the mouth and the tube feet.
• Eyespot: A simple light-sensitive organ located at the tip of each arm of the starfish.
• Anus: The anus of the starfish is located on the top surface of the central disc, near the edge of the body.
• Tube Feet: The tube feet are used for movement, capturing prey, and opening shells. They are located on the underside of the starfish’s arms and are operated by the water vascular system.
• Radial Canal: The radial canal is a part of the water vascular system that runs along the length of each arm.
• Stone Canal: The stone canal is a tube that connects the madreporite to the ring canal.
• Ring Canal: The ring canal encircles the mouth and is the central hub of the water vascular system.
• Gonads: The gonads are the reproductive organs of the starfish and are located in the arms.

Overall, the starfish diagram helps to illustrate the anatomy of these fascinating creatures and the various parts that make up their body structure.