Figure 3
Serotonin-like immunoreactive nervous system in 3-day-old Phoronopsis harmeri . In all images, the apical is at the top, and the oral side is to the right. Z-projections (B-E) of animals after mono- and double staining for serotonin (yellow) and phalloidin (blue). (A) Live whole animal. (B) Anterior portion of the body viewed from the right side. (C) A part of the main nerve ring with multipolar perikarya, which give rise to the tentacular neurites. (D) Neurites and immunoreactive perikarya in tentacles. (E) The most dorsal portion of the main nerve ring with group of dorsolateral perikarya and the most dorsal neurites around the nephridial channel. Abbreviations: ep – epistome; gp – dorsolateral group of perikarya; mdn – most dorsal neurites; nc – nephridial channel; st – stomach; t – tentacle; ten – tentacular neurites; tep – perikarya in the tentacles; tn – tentacular (main) nerve ring; trn – neurites innervating the trunk; trp – perikarya innervating the trunk; tt – telotroch.