Fig. 5. Example of peptidergic innervation of muscles in Cherax destructor. (A) Schematic diagram of the branching pattern of the neurone labelled with an FMRFamide antibody in the oesophageal ganglion (OG), presumably the cardiac dilator neurone 1 (CD1). (B) Schematic diagram of the distribution of FLRFamide-like immunoreactivity on the muscles: regions of the muscles that show FLRFamide-like immunoreactivity are coloured orange; the regions without immunoreactivity are shown in white. (C) An example of the actual FLRFamide-like immunoreactivity on the c5a muscle, which is covered with strongly stained varicosities (montage of two confocal micrographs). Unstained muscles are also present (asterisks). acdn, anterior cardiac dilator nerve; c1 to c5, cardiac sac muscles; cv1, cardiac valve muscle; vcdn, ventral cardiac dilator nerve (for other abbreviations see Fig.1). Scale bar, 200µm (modified from Skiebe et al., 1999). Arrows denote the main axon; the double-headed arrow marks axon collaterals.