Fig. 19

Detail of the tentacle innervation of Stephanella hina. a Lateral view of the lophophoral base showing the main tentacle neurite branches. One medio-frontal neurite bundle has been marked in yellow, one latero-frontal pair in purple, one pair of abfrontal neurite bundle roots in red and two additional radial neurite bundles in grey. b Similar view as in A showing major neurite bundle origins from the circum-oral nerve ring. c Lateral view of the lophophoral base showing the traversal of the additional radial nerve/neurite bundle supplying the outer lophophoral base. d & e Intertentacular perikarya at the additional radial neurite bundle. d Optical section. e Schematic drawing of the main tentacle neurite bundles. Abbreviations: afr – abfrontal neurite bundle roots, arn – additional radial nerve/neurite bundle, con – circum-oral nerve ring, ipk – intertentacular perikarya, ph – pharynx, lfn – latero-frontal neurite bundles, mfn – medio-frontal neurite bundle, php – pharyngeal plexus, rn – radial nerve