Fig. 7

Sensory and neuronal elements of the tentacles. a. Longitudinal view on tentacle showing tentacular musculature (yellow) supported by FMRFamide-lir fibers (cyan). b. An optical cross-section through the same tentacle. c. Sensory elements of the main tentacular nerve revealed by acetylated α-tubulin-lir. d. Sensory elements and FMRF-like innervation in tentacular epithelium and musculature. e. Monociliated sensory ending of octopamine-lir cells. f. SP-lir sensory elements and nerves of tentacles. g. SP-lir sensory cells of the tentacular epithelium. The cell somata are outlined. h. 5-HT-lir fibers of tentacular nerves. Abbreviations: a – axon, an – additional tentacular nerves, cse – monociliated sensory ending, en – efferent neurites, m – tentacular muscles, mn – main tentacular nerve, pn – perikaryon, sc – sensory cell, sci – sensory cilia, ug – unicellular glands