Myomeres

in lancelets, vertebrate animals, and man, segments of thetruncal musculature that are arranged in succession along the longitudinal axis of the body. They develop from myotomes. In the Amniota, myomeres are usually present only in the embryonic stage. The longitudinal muscle fibers of every myomere are attached in front and in back of the myocommata. In flsh and amphibians, myomeres are separated by a horizontal myocomma into dorsal and ventral sections.