In comb jellies, the "reticular theory" was correct!

"The reconstruction revealed a total of three aboral nerve net (ANN) neurons, all of which are syncytial, meaning they have multiple nuclei enclosed in a continuous membrane. The comb jelly’s subepithelial nerve net (SNN), which sits in M. leiydi’s body, is also made up of syncytial neurons [...]. Those were the first syncytial neurons described in any animal."

https://www.thetransmitter.org/connectome/first-nerve-net-connectome-shows-how-evolutionarily-ancient-nervous-system-coordinates-movement/

Wonderful #neuroscience by @jekely