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Onset of Buccal Pumping in Catshark Embryos: How Breathing Develops in the Egg Capsule

Figure 4

Development of pharyngeal skeletal and muscular elements in the pharyngeal region.

A. Schematic diagram of the pharyngeal skeletal and muscular elements of the adult cloudy catshark. B. 3-dimensional reconstructions of pharyngeal skeletal and muscular elements made from histological thin sections. Ventral view of the jaw and pharyngeal skeletal elements (blue) and the hyoid retraction muscle (coracohyoideus; red) in 27.2 mm TL (i), 29.2 mm TL (ii), 32.8 mm TL (iii), and 39.8 mm TL (iv) embryos. Scale bars = 500 µm.

Figure 4

doi: https://doi.org/10.1371/journal.pone.0109504.g004