Think of it like this:
* Dorsal: Like your back.
* Ventral: Like your belly.
Since starfish are radially symmetrical (they have no distinct head or tail), "dorsal" simply means the side facing upwards when the starfish is resting on the ocean floor.
Here's what you'll find on a starfish's dorsal side:
* Spines: These are the sharp, pointed projections that give starfish their defensive ability.
* Skin: The skin is often covered in tiny, bumpy bumps called papulae.
* Madreporite: This is a small, sieve-like opening that is involved in the starfish's water vascular system.
* Eyespots: These are located at the tip of each arm and are sensitive to light.
So, next time you see a starfish, remember that the top side is the dorsal surface!
