part of start stage end stage fin musculature dorsal fin musculature Musculature that is part of the dorsal fin. The dorsal fin musculature is composed of one unit per fin ray that are arranged in series on each side of the body. Each unit is composed of one fin ray, three supporting pterygophores, and a set of paired depressor, erector, and inclinator muscles. zebrafish_anatomy TAO:0000648 ZFA:0000648 dorsal fin pharyngula:prim-15 adult