Fig. 3
Acetylated α-tubulin-like immunoreactive elements (a-d) and serotonin-like immunoreactive elements (d-f) in the nervous system of Barentsia discreta according to cytochemistry and laser confocal scanning microscopy. a Fronto-lateral view of the calyx and the apical part of the stalk, (b) Parasagittal optical section of the calyx showing the aboral nerves (ab) and stalk nerves (sn), (c) Lateral view of the upper part of the calyx showing the lateral nerves (ln), arcuate nerves (arc), tentacle nerves (tn), and starlike cells of the calyx (sc), (d) Lateral view on the calyx showing the distribution of serotonin-like immunoreactive elements, (e) Part of the calyx showing esophageal perikarya (epk) and their neurites (en) with a commissure in between; and perikarya (ppk) and longitudinal peripheral nerves (pn) of the calyx, (f) Complex system of neurites (pn) of the large perikarya (ppk) of the calyx. Abbreviations: ab, aboral nerves; arc, arcuate nerves; cm, commissure; en, esophageal nerves; epk, perikarya of esophageal nerves; ln, lateral nerve; ln1, lateral nerve 1; ln2, lateral nerve 2; ln3, lateral nerve 3; pn, peripheral calyx nerves; ppk, perikarya of peripheral nerves; sc, star-like cells; sn, stalk nerve; st, stomach; tc, tentacle cord; tc3, tentacle cord 3; tn, tentacle nerve