part of develops from start stage end stage superficial adductor adductor superficialis TAO:0000285 ZFA:0000285 Pectoral fin muscle that develops from the primitive pectoral fin adductor. The adductor superficialis originates at the cleithrum and inserts on all fins rays except the first. Insertion of the adductor superficialis on fin rays is distal to the fin ray bases. superficial adductors zebrafish_anatomy pectoral fin musculature adductor muscle primitive pectoral fin adductor larval:days 7-13 adult