Fig. 7

Organization of the cross nerves in Hemithiris psittacea. a Semi-thin cross section of the base of tentacles. b Cross nerve is associated with large globular cell (gc). c Cross nerve is surrounded by several cells of extracellular matrix. d The cross nerve near the epithelium of the brachial fold. e The cross nerve consists of neurites of different diameter and is associated with cell that are filled with glycogenic granules (gg). Abbreviations: ce – cell in extracellular matrix; cn – cross nerve; ecm – extracellular matrix; gc – globular cell; gg – glycogenic granules; it – inner tentacle; nf – nerve fibers; ot – outer tentacle