(from the article `muscle`) ...in the tail forms a solid block of muscle, while in the trunk it encloses the body cavity. Ribs develop in the horizontal septum separating the ... Found on http://www.britannica.com/eb/a-z/m/147
My`o·com'ma noun ; plural Latin Myocommata , English Myocommas . [ New Latin See Myo- , and Comma .] (Anat.) A myotome. Found on http://www.encyclo.co.uk/webster/M/123