Figure 3From: Immunolocalization of serotonin in Onychophora argues against segmental ganglia being an ancestral feature of arthropodsVentral nervous system in Onychophora. Schematic illustration of ventral nerve cords (vn) and associated nerves within two segments of the trunk. Arrow points to one of the peripheral nerves innervating the body wall musculature (only nerve roots are shown). Abbreviations: co, commissure; le, leg nerve; vn, ventral nerve cord.Back to article page