Fig. 2

Schematic drawings of the general organization of the nervous system of Galathowenia oculata. (a) Tubulin-like, (b) serotonin-like and (c) FMRFamide-like immunoreactive nervous systems. Ventral views of anterior and posterior parts, nervous system shown in black, the body wall and chaetae are shown in grey. All three images show the same regions of the specimens, descriptions are given in the text. cc – circumesophageal connectives, ccc – transverse neurites interconnecting cc, cn – serially arranged circular neurite bundles, dc – dorsal commissure, dn – main dorsal neurite bundle, dns – immunocytochemically (ICC) positive somata associated with the main dorsal neurite bundle in head collar, ds – unipolar FMRFamide-lir somata associated with dorsal commissure, dsa – ICC-positive somata accumulation in dorsal pygidial lobe, e – eye, es – large ICC-positive somata around the eyes, exn – epidermal neurite plexus on outer side of head collar, hs – bipolar FMRFamide-lir somata located in head collar, ln – main lateral longitudinal neurite bundles, lnn – lateral neurite plexus between the lateral neurite bundles, pyn – pygidial neurites interconnecting the ventral and dorsal neurite bundles, sc – serotonin-lir cells of collar and dorsolateral folds, ss – serotonin-lir somata, vcs – serotonin-lir somata associated with ventral nerve cord, vlb – ventrolateral neurite bundle in head collar, vnc – ventral nerve cord, vsa – ICC-positive somata accumulations in ventral pygidial lobes