part of start stage end stage myocardium portion of tissue trabecular layer trabecula TAO:0005059 zebrafish_anatomy The layer of the myocardium composed of projections of contractile myocytes. The trabecular layer is bounded internally by the endocardium. Unlike the trabeculations of higher vertebrates, both atrial and ventricular trabeculae of the zebrafish have more strut-like character, and are more uniform without apparent regional differences. Cardiac conduction may occur in the trabecular layer via trabecular fibers, PMID: 12626327. ZFA:0005059 unknown adult