Neck pain often arises from tight neck muscles that pull the neck vertebrae slightly out of alignment, called subluxation, which then impinge on sensory nerves entering the spine between these vertebrae. These sensory nerves relay that information back to the brain setting off the alarm in the form of pain.
Wrist Bending. Forward bending of your wrist is called flexion. This motion is needed for daily activities such as styling your hair, writing, getting dressed, using a screwdriver and lifting heavy objects. Normal wrist flexion is approximately 70 to 90 degrees.
It is easier to demonstrate than to describe it but what I consider cogwheel motion is when (at rest) my hand moves from the wrist (so the wrist is moving, as well as the hand) in a rhythmical manner making about a quarter of a rotation (as if you were tightening a screw). As far as I know it is not due to rigidity.