Somite:A segmented block of mesoderm found in pairs along the head-to-tail axis of a developing embryo that differentiates into various tissues including muscle, vertebrae, and dermis.
Mesoderm:The middle layer of an embryo in early development that gives rise to muscles, bones, and circulatory systems among other structures.
Axial Skeleton:The part of the skeleton that includes the skull, vertebral column, ribs, and sternum, serving as a central framework for supporting and protecting an organism's vital organs