somites

Somites are blocks of mesodermal tissue that form along both sides of the developing embryo's neural tube during early development. They serve as the precursors to important structures such as the vertebrae (spinal bones), ribs, skeletal muscles, and dermis (skin layer). Somites pattern the body plan, segmenting the embryo into repeated units that establish the foundation for the musculoskeletal system. Their formation is tightly regulated by genetic and molecular signals, ensuring proper development of the backbone and associated tissues.