Term: posterior cardinal vein anatomical margin
Name: posterior cardinal vein
Synonyms: axial vein, caudal cardinal veins, PCV, postcardinal vein
Definition: Continuation of the caudal vein cranial to the anal pore. The cardinal vein splits into a pair of vessels in the cranial trunk, just caudal to the radix of the aorta. The posterior cardinals each empty into the common cardinal vein.
Ontology: Anatomy Ontology [ZFA:0000477]

Name: anatomical margin
Synonyms: edge, margin
Definition: Fiat anatomical region extending a short distance from the boundary of an object inwards.
Ontology: Spatial Ontology [BSPO:0000006]