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Fig. 4 | Frontiers in Zoology

Fig. 4

From: Muscle development in the shark Scyliorhinus canicula: implications for the evolution of the gnathostome head and paired appendage musculature

Fig. 4

MyHC expression during muscle differentiation between stages 28 and 29 in Scyliorhinus canicula. Cranial to the left. a-c Stage 28; a While the dorsal constrictor of the mandibular arch is just now appearing, the dorsal constrictor of the hyoid arch is already diving into the adductor arcus palatini and the constrictor hyoideus dorsalis. b The ventral muscles of the mandibular and hyoid arch are all present, while the more posterior ventral branchial muscles are still not developed. c Ventral view of the pectoral fin with the first fin muscle appearing. d-f Stage 29; d The dorsal constrictor of the mandibular arch divides into the spiracularis and the levator arcus palatini. e Enlarged window to show the faint cucullaris staining. f Ventral branchial and hypobranchial muscles further differentiated. Scale bar = 1 mm

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