Ivashkin E.G., Khabarova M.Yu., Melnikova V.I., Kharchenko O.A., Voronezhskaya E.E. 2017. Local serotonin-immunoreactive plexus in the female reproductive system of hermaphroditic gastropod mollusc Lymnaea stagnalis // Invertebrate Zoology. Vol.14. No.2: 134–139 [in English].
ABSTRACT: Serotonin is known as general regulator of reproductive activity in molluscs. Here we presented a detailed description of morphological backgroung of 5-HT synthesis and reliase by local serotonin-immunoreactive (5-HT-IR) plexus in the female reproductive system of hermaphroditic gastropod Lymnaea stagnalis. Three distinct parts of 5-HT-IR local network can be distinguished: weak innervations of the oviduct by solitary fibers, rich innervations of oothecal gland muscular layer by varicose fibers, and dense plexus of 5-HT-IR cells and their processes along the epithelium and in the muscular layer of uterus (pars contorta). Fusiform and multipolar 5-HT-IR cells located intraepitheliarly and have big nuclei. The thick apical process entered the epithelium and contacted the inner lumen of the duct. Basal processes of numerous cells compacted into bundles which organized the basket-like 5-HT-IR plexus surrounding the epithelial lumen of the canal.
KEY WORDS: Gastropoda, uterus, local network, serotonin, secretory cells.