Which of the following is formed by syndetomes?

Syndetomes are specialized structures that arise during embryonic development, specifically from somites, which are segments of mesodermal tissue. The primary role of syndetomes is to give rise to the tendons that attach muscles to bones.

Syndetomes differentiate into tendon cells and are crucial in forming the connective tissue that connects skeletal muscle to bone, facilitating movement and stability in the musculoskeletal system. The development of tendons occurs alongside that of muscles and bones, as they all coordinate in the context of an integrated musculoskeletal system; however, the specific formation of tendons is directly attributable to the syndetomes.

In contrast, vertebrae are formed from sclerotomes, which also differentiate from somites. Muscles are derived from myotomes, another component of the somites, while skin originates from the ectoderm and is not related to syndetomes. This clear link between syndetomes and tendon formation makes the answer focused on tendons the most accurate in this context.