The primary role of ligaments is to connect what structures?

Ligaments are dense connective tissues that have a crucial role in the musculoskeletal system by connecting bone to bone. Their primary function is to provide stability and support to joints by holding the bones together, allowing for proper movement while also preventing excessive motion that could lead to injuries. This structural support is essential for maintaining joint integrity under various conditions, including physical activity and weight-bearing exercises.

The other options do not describe the primary function of ligaments. For instance, muscles are connected to bones by tendons, not ligaments, which distinguishes their roles in the body. Similarly, cartilage primarily serves as a cushion for joints and does not connect directly to muscle, and the connection of skin to muscle involves fascia and other tissues, again separate from the primary role of ligaments. Thus, the connection of bone to bone by ligaments is the most accurate description of their function.