Fig. 8

Functional annotation of the C. elegans connectome allows visualization of causal relationships within and among neural circuits. Black or grey arrows indicate synaptic connections from electron microscopy of serial sections. Coloured solid arrows indicate activating (green) or inhibiting (blue) synaptic connections. Coloured dotted arrows indicate activating or inhibiting indirect or extra-synaptic connections. Bold outlines on neurons indicate the sign of the neuron on the specified behavior. Fill colour on neurons indicates the effect of the specified input on neural activity. A Synaptic connectivity for subset of neurons involved in both CO₂ avoidance behavior and egg-laying behavior. B Neurons activated or inhibited by CO₂ are indicated by fill color, neurons contributing to CO₂ avoidance behavior indicated by outline color. C Neurons activated or inhibited by serotonin are indicated by fill color, neurons contributing to egg-laying behavior indicated by outline color