Fig. 9

Innervation of the body wall, membranous sac, and digestive tract in Crisia eburnea (CLSM). Z-projections after mono- and double staining for tyrosinated α-tubulin (grey) and DAPI (green). Zooids with protruded (a-f) and retracted (g-i) lophophores are used. (A) The circular neurite bundle of atrial sphincter is located at level of cardia. Oral side is to the left. b Some nerve fibers with perikarya in the circular neurite bundle of atrial sphincter. Oral side is to the left; tentacles are to the top. c Large perikarya giving rise to the short longitudinal projections are associated with the circular neurite bundle. d Multipolar perikarya in the body wall. e Two closely contacted multipolar perikarya and their projections. f Nerve net of the membranous sac. g Perikarya and neurites of the cardia. h Perikarya around the caecum. i Some neurites and perikarya associated with cardia, caecum, and funiculus. Abbreviations: bln – branches of the longitudinal nerves of the body wall; ca – cardia; cae – caecum; cns – circular nerves of atrial sphincter; es – esophagus; lnw – longitudinal nerves of the body wall; lp – large perikarya; mc – muscle cells; mo – mouth; mup – multipolar perikarya; nfu – neurites of funiculus; nn – nerve net of the membranous sac; ph – pharynx; pk – perikarya; pmu – projections of multipolar perikarya; slp – short longitudinal projection; st – stomach; t - tentacles