The bulk (>90%) of the myotome of most fish is composed of white or anaerobic, fast-twitch muscle.
It is hypothetically arranged in epaxial and hypaxial helixes on each side of the fish (alexander1969). Individual myomeres display a ‘W’ shape, with epaxial and hypaxial
anterior-pointing cones along with nested posterior-pointing cones and a central
anterior-pointing cone (Fig.1).