part of develops from start stage end stage pectoral fin musculature abductor profundus Abductor muscle that develops from the primitive pectoral fin abductor. It originates along the anterior skeletal flange of the pectoral girdle. The abductor profundus bundles insert onto the fin ray base proximal processes of all fin rays. abductors profundus ZFA:0000614 TAO:0000614 zebrafish_anatomy abductor muscle primitive pectoral fin abductor larval:days 7-13 adult