Fig. 4

Anterior nervous system of adult Hypania invalida, cLSM micrographs. A. General anatomy of the serotonergic nervous system. The central nervous is highlighted in green, ventral region of brain and tentacle nerves in blue and branchial neurites in red. B. Close-up of brain region stained against acetylated α-tubulin. Ventral region of brain and tentacular nerves highlighted in white. C. General anatomy of the tubulinergic nervous system. Ventral region of brain, tentacular nerves and laterally branching nerves are highlighted in white. D. Close-up of the ventral brain region stained against α-tubulin, ventral brain region highlighted in white. Connectives of the ventral brain region to the dorsal brain region, the cc and the stomatogastric nerve loop are shown. E. Close-up of the ventral brain region stained against α-tubulin, ventral brain region highlighted in white. Tentacular nerve originate from both roots of the ventral brain region. Brga – ganglion of branchiae; brn – branchae nerves; cc – circumoesophageal connective; cdbr – connective of dpbr; cvbr – connective of vpbr; dpbr – dorsal region of brain; drcc – dorsal root of cc; dvbr – dorsal root of vpbr; ln – lateral nerves; lon – lateral organ nerve; pn – peripheral nerves; prn – prostomial nerves; stn – stomatogastric nerve; stnl – stomatogastric nerve loop; tn – tentacular nerves; vnc – ventral nerve cord; vpbr – ventral region of brain; vrcc – ventral root of cc; vvbr – ventral root of vpbr