Fig. 2. Frontal reconstructions of -aminobutyric acid (GABA)-immunoreactive neurons innervating the accessory medulla (AMe). (A) Approximately 25 neurons send primary neurites into the AMe. From the AMe, immunostained processes continue in the distal tract (DT) along the anterior surface of the medulla (Me) and enter the medulla at several sites. The arrowhead points to the cell body of a neuron with a unique morphology shown in B. (B) The arborizations of a large immunostained neuron could be reconstructed individually. This neuron innervates the AMe and has tangential arborizations in the medulla. Six neuronal processes give rise to extensive ramifications in the lamina (La) and in small accessory laminae at the posterior inner edge of the lamina (arrows). Scale bar (applies to both), 100 µm.