part of part of develops from develops from posterior cardinal vein vasculature of trunk tail vein trunk blood vessel mesoderm-derived structure intersomitic vein tail vasculature parachordal vessel 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:2005034 ZFA:0005034 PAV Vessels run longitudinally along the horizontal myoseptum. These vessels are not functional until after lumenization which occurs near 4 dpf. Isogai et al. 2003.