Alan Rawls and Eric N. Olson domains, the sclerotome, myotome, and dermomyotome. Initially, the ventral region of the somite acquires Department of Molecular Biology and Oncology The University of Texas Southwestern Medical Center a mesenchymal phenotype and forms the sclerotome, from which the ribs and vertebrae and derived. The dorat Dallas 6000 Harry Hines Boulevard sal half of the somite fo...