  Despite the relative simplicity of C. elegans, its locomotion machinery is
not yet well understood. We focus on the generation of dorsoventral body bends.
While central pattern generators are commonly involved in animal locomotion,
their presence in C. elegans has been questioned due to a lack of an evident
neural circuit to support it. We developed a computational model grounded in
the available neuroanatomy and neurophysiology and we used an evolutionary
algorithm to explore the space of possible configurations of the circuit that
matched the neural traces observed during forward and backward locomotion in
the worm. Our results demonstrate that it is possible for the rhythmic
contraction to be produced by a circuit present in the ventral nerve cord.
