What is the main function of a ligament in the body?

The main function of a ligament in the body is to connect bone to bone. Ligaments are tough, fibrous connective tissues that provide stability to joints by holding the bones in place. They help to maintain the proper alignment of bones, which is crucial for joint function and overall movement. By connecting bones at joints, ligaments play a vital role in preventing excessive movement that could lead to injuries such as sprains or dislocations.

In contrast, other options describe different structures and functions within the body. For instance, tendons connect muscle to bone, which is essential for facilitating movement as muscles contract. Muscle flexibility is supported by other tissues and training methods rather than being a primary role of ligaments. While some ligaments can contribute to the protection of internal organs indirectly through maintaining joint integrity, this is not their primary function. Thus, the key role of ligaments in connecting bone to bone is central to their importance in maintaining joint stability and function.