Fig. 5

Developmental processes of the premuscle masses in the pectoral fin/forelimb buds. a Development of the pectoral fin premuscle masses in the shark shown in a transverse section (based on Okamoto et al. [129]). b Bifurcation of each pectoral fin premuscle mass in the shark in lateral view (based on Okamoto et al. [129]). c Development of the pectoral fin premuscle masses in the lungfish shown in a transverse section (based on Semon [99]). d Development of the forelimb premuscle masses in the lizard shown in a transverse section (based on Corning [112]). e Development of the forelimb premuscle masses in the chicken shown in a transverse section. f Phylogenetic relationship among taxa illustrated in (a–e). dMMP, dorsal route of migratory muscle precursors (MMPs); dmt, dermomyotome; dmtv, ventral process of the dermomyotome; msp, Muskelsprosse; pecf, pectoral fin bud; vMMP, ventral route of MMPs