ChristianKl comments on How good are our mouse models (psychology, biology, medicine, etc.), ignoring translation into humans, just in terms of understanding mice? (Same question for drosophila.)

[ChristianKl]

C. elegans indeed has a fixed number of neurons (and other cells) and that’s partly the reason why it gets used as model organism.

There’s the OpenWorm project (googling also finds WormSim) that tries to model C. elegans whole neurology. From what I heard from people with domain expertise the model isn’t good enough for us to say that we truly understand everything.