circumesophageal nerve ring

circumesophageal nerve ring
(Class Ostracoda):
Well-developed ring of nerve tissue surrounding esophagus; consists anteriorly of supraesophageal ganglion, laterally of circumesophageal connective, and posteriorly of complex formed by subesophageal ganglion and more or less concentrated central nerve cord [Stachowitsch, 1992].

Crustacea glossary. . 2011.

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  • nerve ring — Any ring of nerve fibers, may be around the mouth, esophagus, anus, bell margin, etc; see circumesophageal commissure …   Dictionary of invertebrate zoology

  • circumesophageal connective — (Order Decapoda): One of two strands of nerve tissue surrounding esophagus and connecting dorsal supraesophageal ganglia with posterior subesophageal ganglia. May bear ganglia (paraesophageal ganglia). (Syn. esophageal connective) [Stachowitsch,… …   Crustacea glossary

  • circumesophageal commissure — The major commissure of the nervous system of many invertebrates to which and from which ramify anteriorly and posteriorly directed nerves and nerve cords; sometimes called the nerve ring …   Dictionary of invertebrate zoology

  • ventral nerve cord — Ganglia or connectives in somites joined by single or double tract of nerve fibers running longitudinally beneath alimentary canal [McLaughlin, 1980]. (Order Cladocera): Pair of widely separated, longitudinal nerve cords extending into trunk from …   Crustacea glossary

  • esophageal ring — noun : a circle of nerve tissue surrounding the gullet in many invertebrates (as annelids and arthropods) called also circumesophageal ring …   Useful english dictionary

  • supraesophageal ganglion — (Order Amphipoda): Concentration of nerve tissue above (anterior to) esophagus in head. Connected to subesophageal ganglion by pair of esophageal connectives. (Syn. brain) [Stachowitsch, 1992]. (Order Isopoda): Concentration of nerve tissue above …   Crustacea glossary

  • subesophageal ganglion — Anterior ganglion of the ventral nerve cord, located beneath (posterior to) the esophagus and connected dorsally to the tritocerebrum. (Syn. subenteric ganglion) [Brusca and Brusca, 2002]. Nerve plexus below esophagus in head of malacostracans… …   Crustacea glossary

  • central nervous system — In invertebrates, a system to which the sensory impulses are transmitted and from which motor impulses pass out. a. In radially symmetric animals, structured in the form of one or two rings. b. In elongate animals, usually consists of an anterior …   Dictionary of invertebrate zoology

  • nervous system — Anat., Zool. 1. the system of nerves and nerve centers in an animal or human, including the brain, spinal cord, nerves, and ganglia. 2. a particular part of this system. Cf. autonomic nervous system, central nervous system, peripheral nervous… …   Universalium

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