The skeleton provides a structural framework. This is moved by the muscles that contract or extend and in order to function, cross at least one joint and are attached to the articulating bones.

The muscles provide a structural framework and are moved by bones to which they are attached by ligaments.

The skeleton provides a structural framework; this is moved by ligaments that stretch and contract.

The muscles provide a structural framework, moving by contracting or extending, crossing at least one joint and attached to the articulating bones.