A wide flat, ribbon-shaped, sheet of dense fibrous tissue thatacts as a tendon for flat muscles containing fibroblasts that secrete collagen. Forexample, the sheet-like ventral abdominal musclesare united in the body midline by anaponeurosis. An aponeurosis can also exist without amuscle, where it is a fibroussheet of connective tissue (e.g., plantar aponeurosis found on theplantar surface ofthe foot). Structurally similar to ligaments and tendons, they have little blood supply and their main function is not only to join muscles, but also the parts of the body that muscles act upon, including bone as well as muscle. They become evident during the embryonic period in humans.
See Collagen, Fibroblasts, Musculoskeletal system