Myomeres


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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.

References in periodicals archive ?
After several days, some tadpoles showed a significant reduction in tail-fin area (> 20%) and, in more extreme cases, the tail myomeres were also damaged (16% of a random sample of 30 tadpoles).
costatus larvae had 38-43 myomeres, whereas P argenteus had 42-43, and button of arches became evident (Fig.
In most taut-skinned fishes, the body core musculature is made up of segmented and serially arranged, cone-shaped myomeres divided into epaxial and hypaxial muscle groups by a horizontal septum (Liem et al.
Pigmentation patterns, counts of myomeres, head spines, and fin rays, and various measurements were recorded.
Trunk myomeres were counted from the myomere partly containing the most posterior gill opening to the last myomere with posterior angle positioned above the cloaca (Hubbs & Trautman 1937).
The distribution is not symmetrical between left and right sides; they are separated by 1 to 4 myomeres in dorsal view.
Line of pigment on ventral body margin from 4th to 6th myomeres posterior to anus to penultimate posterior myomere.
For meristic characterization, we quantified, whenever possible, the number of pre- and post-anal myomeres, and the number of rays in the pectoral (P), pelvic (V), dorsal (D) and anal (A) fins.
They have also found that the flattened eel-like creatures had skeletal muscles called myomeres and a basic blood vessel system.
Another characteristic of chordates are myomeres, blocks of muscle tissue often arranged in a zig-zag pattern.