Figure 6.

Diagram of the connections between neurons that primarily lead to head muscles, from ‘The mind of a worm’ [1, fig. 21c]. Triangles represent sensory neurons, hexagons are interneurons and circles are motor neurons. Lines with arrowheads represent the directions of chemical connections; whether these are excitatory or inhibitory cannot be determined from the electron micrographs. Cross lines behind arrowheads indicate relative strength of connection. Lines ending in bars are connections created by gap junctions. Each connection is made by one or more synapses. Connections to additional neurons are given in the lists. Copyright © The Royal Society.