Skip to main content
Fig. 3 | Frontiers in Zoology

Fig. 3

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

Fig. 3

MyHC expression during muscle differentiation between stages 23 and 27 in Scyliorhinus canicula. In all figures anterior (or cranial) is towards the left. a-d left lateral views; e ventral view. a Stage 23; six pharyngeal arches (1–6) and the first three pharyngeal clefts (C1–3, opening of the pouches 1–3) are visible. The first pharyngeal arch is the mandibular arch, the second is the hyoid arch and the following four are branchial arches I-IV. b Stage 24; first cephalic muscle anlagen are indicated by faint staining laterally in the hyoid arch (constrictor hyoideus dorsalis) and the first three branchial arches (constrictores branchiales I-III); the opening of the fourth pharyngeal pouch (C4) is visible; first external gill buds appear. c Stage 26; the pectoral fin bud is clearly developed. d-e Stage 27. d Muscle development is clear in the hyoid arch (constrictor hyoideus dorsalis) and branchial arches I to III (constrictores branchiales I-III). e First muscle staining appears ventrally in the mandibular arch. Scale bar = 1 mm

Back to article page