11. Formal inversion in C. elegans - B.

A Minimal Model Bilateria Brain. Each black blob here represents the cell body of a neuron. The nerve ring of cell fibres and its extension into the belly of the worm is shown in yellow. The main brain circuitry for our current 'broad brush' purposes is the amphid complex, which includes circuits for taste, smell, touch and heat sensation -- all of which have evolved equivalents in our own brains and some of which are already known to be involved in learning and memory in the worm.

You should now imagine that you are looking at the worm brain from above and behind as indicated by the yellow arrow -- and that you can see four neurons, as in the next picture.

[Diagram developed from data published by White et al. (1986)].