The stinging cells of a jellyfish are called cnidocytes, a singular feature of jellies and their relatives such as corals and sea anemones. Inside these cells are an organelle called the nematocyst, which contains what Colin describes as a capsule with little harpoons coiled up inside.

Jellyfish also have clusters of nerve endings (almost like neurons) called rhopaliaalong their bells. Rhopalia allow jellyfish to sense light and maintain balance, ultimately helping jellies determine which way is right-side up. Did you know jellyfish are among the oldest species of animals in the world? Fossils have been found that indicate jellyfish have been around for more than 500 million years. Even without bones, brains, lungs or a heart, sea jellies have certainly made their mark in our beautiful ocean and our hearts. Instead of a brain, a sea jelly has a set of nerves commonly referred to as a nerve netor nerve ring. This nerve net helps them detect shifts in their environment, including temperature, gravity, water salinity, oxygen concentration, vibrations and currents. These nerves are responsible for the jellyfish’s automatic responses.

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The peach flavor gelatin is not only tasty, but it has a light enough color to take on the food dye very well. Especially once mixed with the evaporated milk, which makes it opaque. I want My Brain to Be Grey And, you don’t need to keep it fleshy colored if you don’t want to. Use green jello for a moldy looking brain. Or blue jello for a frozen cold brain. You could even toss some gummy worms inside the jello before it’s set for a super creepy look! Let’s keep in touch

The gastrodermisis the layer on the underside of the jellyfish bell and aids in extracellular digestion and gas exchange. Again, the peach flavor is good for this. If you have an unflavored gelatin, not only will it probably taste like brains, but the color will be easier to control. Though I doubt anyone will eat it, lol! The gastrovascular cavityis the inner part of the jellyfish that functions as the entire digestion system. There is one orifice that (to put it politely) serves both ingestion and elimination needs for the jellyfish. This multipurpose area is the access point to the gastrovascular cavity.Add food coloring to making the brain resemble gray matter. Because food coloring formulas may vary, add colors slowly so you can adjust the color as needed. For this brain, I used 6 drops of blue and 5 drops of red food coloring. A jelly's stinging nematocysts are like that horror movie maniac who just doesn’t quit. You can get stung by a detached tentacle, or even by a dead jelly.