The broad, tendon-like sheet into which the latissimus dorsi muscles fuse in the lower back is an example of which structure?

1. In some places, the mysia connective tissue layers fuse with a broad, tendon-like sheet rather than a rope-like tendon. 2. This broad sheet is called an aponeurosis. 3. The example given is the sheet in the lower back into which the latissimus dorsi (the "lats") fuse. 4. A triad and a sarcomere are microscopic contractile structures, and the epimysium alone is just the outer muscle wrapping, none of which are the broad tendon-like sheet described. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 10 "Muscle Tissue", section 10.2, p. 408_