part of part of in taxon results in morphogenesis of anatomical structure morphogenesis fin morphogenesis pectoral fin development pectoral fin morphogenesis GO:0035138 The process in which the anatomical structures of the pectoral fin are generated and organized. Pectoral fins are bilaterally paired fins mounted laterally and located behind the gill covers of fish. These fins are used for lateral mobility and propulsion. Vertebrata <vertebrates> pectoral fin