Do Starfish have brains?

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Their entire nervous system acts like a distributed brain. A sea star (starfish) manages nicely without a control center made up of white and gray matter, housed in a head — what we think of as a brain. Their entire nervous system acts like a distributed brain.

So, it has a brain — just not like ours. Clusters of nerves (ganglia) ring its center like a spider web. Nerves branch off from this central system and run radially out the arms.

The branches of these nerves coordinate arm movements. In some species and individuals, one arm almost always takes the lead when the sea star walks. More often, though, the arms take turns.

This exotic creature moves by taking in seawater and channeling the water through a system of canals ringing its center. It changes water pressure to push out its feet and move. Its eyespots, located at the ends of the arms, sense light.

Changes in light intensity may, for example, cause different nerve firing rates, which can induce a sleep-like state. Some stars shun light; others seek it. Minute clam odor traces can excite the nervous system, which then launches an attack on the prey.

Some star species pry open clam shells (a slit as tiny as the diameter of a blood-cell is enough). It then injects its stomach (inside out) into the opened home to eat the hapless clam. The stomach releases digestive juices and absorbs the resulting soup.

Great question! Sources: wonderquest.com/sea-stars-nights-space-r... .

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