Term: pectoral fin posterior side
Name: pectoral fin
Synonyms: forefin, pectoral fins
Definition: Paired fin that is located in the thoracic region of the body.
Ontology: Anatomy Ontology [ZFA:0001161]

Name: posterior side
Synonyms: caudal, posterior
Definition: An anatomical region that is the entire part of an anatomical structure posterior to a transverse plane and bounded on one side by the same transverse plane.
Ontology: Spatial Ontology [BSPO:0000056]