Figure 5

General anatomy of the peripheral nervous system. a: Horizontal section of the post-cerebral nervous system showing serotonin-like immunoreactive neurites and somata of the medullary cord (mc) as well as the subepidermal plexus (arrowheads) and the stomatogastric plexus (stp). b: Transverse section showing FMRFamide-like immunoreactivity in the medullary cord (mc), the subepidermal plexus (arrowhead), the commissural plexus (cp), the stomatogastric plexus (stp), and the plexus of the proboscis wall (pp). c: Serotonin-like immunoreactivity in a horizontal section reveals a diffuse arrangement of neurites in the subepidermal plexus (corresponding to arrowheads in a and b). d: FMRFamide-like immunoreactivity in a horizontal section demonstrates that neurites of the commissural plexus are preferentially oriented in circular manner. epi epidermis. Scale bars: a,c,d = 80 μm; b = 200 μm.