In some skulls, a downward projection from the lateral part of the jugular process (an occasional process of bone extending downward from the jugular process of the occipital bone (bone forming the rear and rear bottom of the skull in humans) which may articulate (having joints where separation may occur naturally) with the transverse process (either of the two bony projections on the sides of a vertebra) of the atlas (the uppermost bone of the vertebral column, which supports the skull).