Final answer:
A wide, thin, sheetlike tendon is known as an aponeurosis. It connects muscles to bones or other muscles and provides support and strength.
Step-by-step explanation:
A wide, thin, sheetlike tendon is known as an aponeurosis. An aponeurosis is a broad, flat tendon that connects muscles to bones or other muscles. It is made up of collagen fibers and provides support and strength to the muscles it connects to.
For example, the latissimus dorsi muscles in the lower back fuse into an aponeurosis, which then attaches to the bones of the lower back. This allows the muscles to pull on the bones and produce movement.
Other examples of aponeuroses include the abdominal muscles, which have aponeuroses that connect to the midline of the abdomen, and the palmar aponeurosis in the hand, which connects the muscles of the palm to the fingers.