start stage end stage abductor muscle primitive pectoral fin abductor 2012-05-08T03:59:41Z Abductor that originates at the cleithrum the muscle fibers run in sheets along the endoskeletal disk extending dorsally and caudally from its base. Distally, the muscles insert onto the fin membrane. ZFA:0005651 zebrafish_anatomy Ceri unknown larval:days 14-20