Fig. 5

MyHC expression during muscle differentiation between stages 30 and 31 in Scyliorhinus canicula. a, Cranial to the right; b-e, Cranial to the left. a-b Stage 30; a Spiracularis and levator arcus palatini start to separate, while the dorsal muscles of the hyoid arch are widely separated. The cucullaris extends, but does not attach to branchial arches. b Branchial and hypobranchial muscles further differentiated. c-e Stage 31; c Mandibular and hyoid arch muscles become better distinguishable. d Ventrally the intermandibularis and interhyoideus come into contact and four coracobranchiales are now visible. e In the pectoral fin, the adductor superficialis and abductor superficialis are clearly visible. Scale bar = 1 mm