vein intersomitic vein EMAPA:26056 The vein that sprouts from the posterior cardinal vein, growing dorsally between the somites, and then joining, and draining the dorsal longitudinal anastomosing vessel. segmental vein ISV SCTID:361448009 UBERON:0007679 intersegmental vein ZFA:0001057 TAO:0001057 intersomitic vessel