Fig. 9From: The nervous system of the lophophore in the ctenostome Amathia gracilis provides insight into the morphology of ancestral ectoprocts and the monophyly of the lophophoratesUltrastructure of the cerebral ganglion in Amathia gracilis. Ultrathin cross sections; the anal side is toward the top, and the oral side is toward the bottom. a Three neuropiles of the cerebral ganglion marked by colors: proximal - cyan, central - blue, distal - violet. b Overview of all zones of the cerebral ganglion: perikarya of proximal, central, and distal zones. c Portion of the central zone - neuroepithelium. The lumen of the cerebral ganglion is filled with apical projections of the nerve cells, which connect via desmosomes (arrowheads) and bear the basal body. Abbreviations: bb - basal body; cnp - central neuropil; cpk - perikarya of central zone; dnp - distal neuropil; dpk - perikarya of distal zone; lu - lumen of cerebral ganglion; mv - muscle of vestibulum; n - nucleus; sr - striated rootlet; pj - apical projections; pnp - proximal neuropil; ppk - perikarya of proximal zone; vw - wall of vestibulumBack to article page