What lever is the head and neck extensors?

The head and neck extensors act as a third-class lever in the body. In this lever system, the fulcrum is located at the atlanto-occipital joint (where the skull meets the spine), the effort is applied by the extensor muscles at the back of the neck, and the load is the weight of the head. This arrangement allows for a greater range of motion and speed, though it requires more effort to lift the load compared to first-class levers.