[Cellular organization of the common nerve plexus of the body wall of Nephthys ciliata (Polychaeta) in connection with the problem of relative morpho-functional autonomization of peripheral chain of the central nervous system of annelides].
This study deals with neurohistologic analysis of the common nerve plexus of the body wall of the polychaete Nephthys ciliata. The cell composition and international relations are shown in the nerve plexus subepidermal and intramuscular areas. Morphological data are presented about a possible origin, on the basis if differentiating primary sensory bipolars, of typical associative and presumably motor neurons located outside the abdominal brain. In the nerve plexus, both axo-axonal and axo-dendritic as well axo-somatic international contacts are shown. A characteristic feature of the studied peripheral nerve plexus of the Nephthys ciliata body wall is emphasized: a sufficiently pronounced development of population of associative neurons. This provides the structural basis for peripheral integration of nervous processes in the central nervous system of the whole animal. This work also describes small groups of sensory and associative neurons; they also seem to serve for a relative autonomization of the peripheral chain of the central nervous system of Nephthys ciliata. This also can be facilitated by single presumed motor neurons of the plexus. In the studied nerve plexus there are actually absent the typical associative-motor neurons that are so characteristic of the abdominal brain of polychaetes, oligochaetes, and leeches.
Iu P
IuP
Lagutenko
D000818:Animals; D001369:Axons / Q000648:ultrastructure; D002490:Central Nervous System / Q000166:cytology*; D003712:Dendrites / Q000648:ultrastructure; D009474:Neurons / Q000166:cytology* / Q000502:physiology; D011077:Polychaeta / Q000166:cytology*