FIGURE 2.

The Drosophila Larva A27h-related Locomotor Circuit. A, Drosophila larva showing ventral nerve cord (VNC) and brain lobe(s), with three segments labelled from most posterior (left, n - 1) to most anterior (n + 1, right). B, connectivity diagram of the neurons of the larval locomotor circuit. Sensory neurons appear in pink boxes, interneurons in blue circles and motor neurons in orange boxes. Small green arrows represent excitatory synapses, red T-bars represent inhibitory synapses, and grey paths show synapses that have not been completely characterised. F2 and F3 refer to muscle groups discussed in the text. Large green arrows shown in both A and B represent direction of travel, to illustrate that waves of neural activity move from posterior to anterior segments, as the larva crawls forward. See Supplementary Animation 1 for an animated version of this figure.