title: [Ultrastructural characteristics of interneuronal and neuromuscular relations in the trunkal part of the intraepidermal nervous system in Nerilla sp. (Archiannelida)].
abstract: This study deals with ultrastructural analysis of interneuronal and neuromuscular relations in a representative of archiannelid Nerilla sp. with primitive intraepidermal type of the nervous system. A particular attention has been paid to the area of ventral ciliate groove and the associated site of epidermis. In the ciliate groove, sensitive and motor cilia are revealed and described. Sites of axonal terminals of the sensitive cells supplied with cilia are noted in the epidermal nervous plexus. Epidermal-muscular cells and nervous terminals on them are revealed. Various interneuronal contact variants both of non-synaptic and of typically synaptic types are described. An attention is drawn to a rare presence of compounds from the type of tight junctions among interneuronal contacts in Nerilla sp. In sufficiently differentiated synapses of the chemical type, phenomena of exocytosis are described. There are shown specific features of innervation of longitudinal (somatic) musculature of the nerillid body with entrance of synaptic vesicles into the basal plate substance and their translocation into the depth of the muscular layer.
authors.forename: Iu P
authors.initials: IuP
authors.lastname: Lagutenko
mesh_terms: D000818:Animals; D000845:Annelida / Q000648:ultrastructure*; D004817:Epidermis / Q000294:innervation; D009469:Neuromuscular Junction / Q000648:ultrastructure; D009474:Neurons / Q000648:ultrastructure; D017729:Presynaptic Terminals / Q000648:ultrastructure; D013569:Synapses / Q000648:ultrastructure