part of start stage end stage trabecular layer of ventricle cardiac muscle transverse band 2015-02-19T03:48:37Z Ceri zebrafish_anatomy Cardiac muscle located in the trabecular layer of the ventricle that spans the central lumen near the ventricular apex. The transverse muscle band superficially resembles the septomarginal trabecula found in reptilian and mammalian hearts in that it spans the ventricle. ZFA:0005827 larval:protruding-mouth adult