The muscles lying beneath the skin form the part of body wall. They are thick in dorso-lateral regions.They length of body present ina series of v-shaped myotomes or myomeres. The pointed apex of the vis anteriorly. In B.lanceolatum 60-62 myotomes are present. Myotomes are enveloped in a thin connective tissue layer . Due to their peculiar arragement several myotomes and myocommata . The myotomes help in lateral undulating movements of body as they can be twisted .Their contractions help in driving water of atrival cavity out of the atriopore.
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