Why is the scapulothoracic region not classified as a functional joint?

The scapulothoracic region is not classified as a functional joint primarily because it lacks ligamentous connections, which are a defining characteristic of traditional joints. Unlike synovial joints, which have ligaments that stabilize and allow movement, the scapulothoracic articulation is formed by the interaction between the scapula and the ribcage, where there is no direct bony connection or ligaments to hold them together in the way that is typical of other joints.

This anatomical structure allows for greater mobility of the scapula, enabling a wide range of movements necessary for various shoulder activities. The absence of ligamentous connections contributes to its classification as a functional region rather than a traditional joint, emphasizing its role in facilitating movement rather than serving as a typical joint connection.