What is a sheet of thin flat muscle?

A sheet of thin flat muscle refers to a type of muscle tissue that is organized in a flat, sheet-like structure, often found in various parts of the body. Examples include the diaphragm, which separates the thoracic and abdominal cavities, and the abdominal muscles, which help in movement and support. These muscles play crucial roles in functions such as respiration and maintaining posture. Their flat shape allows for efficient contraction and expansion over a broad area.