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In most adult ectotherms smooth-surfaced myocardium, the bulboauricularlamelle (bal), is interspersed between the atrioventricular canal and the ventricular trabeculations. A similar design is seen in embryonic hearts of mammals and birds. orange dot, bulboventricular fold or free-standing part of the muscular ridge. The image of the zebrafish heart is adopted and modified from [65].
