develops from OBO_REL:part_of (UNDECLARED) radial pectoral fin endoskeletal disc pectoral fin radial Pectoral fin radials are the internal skeletal supports of the pectoral fin which develop from the pectoral fin endoskeletal disc, supports the pectoral lepidotrichia or fin rays and connects the lepidotrichia with the primary pectoral girdle. TAO:0001586 There are two paired series of pectoral radials, the proximal and the distal ones that may have variable shapes and sizes. pectoral actinost teleost_anatomy pectoral fin skeleton