Fig. 12

Overview of the central nervous system of Asajirella gelatinosa stained against acetylated-α-tubulin and 3D-recontruction of the cerebral ganglion. A, B Scans of the lophophoral arms showing the ganglionic horns projecting from the cerebral ganglion into the lophophoral arms. C Scan of the mouth opening and oral tentacles. A circumoral nerve ring surrounds the mouth opening. Proximally, a pharyngeal plexus is associated with the nerve ring. D 3D-reconstruction of the cerebral ganglion situated between pharynx and intestine showing several projections such as the circumoral nerve ring, the epistomial horns and the ganglionic horns. E Detail of the innervation of the oral tentacles showing the mediofrontal tentacle neurite bundles and the radial nerves branching off from the nerve ring. arn additional radial nerve, cg cerebral ganglion, ci cilia, con circumoral nerve ring, drn distal radial nerve, ec epistome coelom, eh epistome horns, enb epistome neurite bundles, gh ganglion horns, int intestine, lfn laterofrontal tentacle neurite bundle, ln lateral nerves, mfn mediofrontal tentacle neurite bundle, mo mouth opening, ot oral tentacles, ph pharynx, pp pharyngeal plexus, rn radial nerve