21 dpf Development
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|Description||By 514 hpf, Meckel’s cartilage (Mk) has grown considerably from that seen at 338 hpf. Also visible are the palatoquadrate (pq), dentary (d), premaxilla (pm), maxilla (mx), retroarticular bone (ra), anguloarticular (aa), and quadrate (q). The dentary has now grown medially in the dermis along the anterior-posterior length of Meckel’s cartilage, and is found laterally to the anguloarticular posteriorly. Note the complete articulation between bones of the jaw joint, including the quadrate, anguloarticular, and retroarticular.|