part of part of duct swim bladder ductus communicans This class was sourced from an external ontology (teleost_anatomy). Its definitions, naming conventions and relationships may need to be checked for compatibility with uberon UBERON:2001437 The constriction between the anterior and posterior chambers of the swim bladder. There does not appear to be an identifiable sphincter in the ductus, and therefore other musculature may regulate its opening. Finney et al, 2006. ZFA:0001437