Stress in the intervertebral cartilage along the neck for different mass distributions along head and neck.

The neck was assumed to be in a horizontal position. Neck density was assumed as 0.5−3. Original, mass distribution as used for the calculations in Figure? 3; heavy head, 20% mass were added to the head and to the foremost section of the neck from c1 to c3; light head, 20% mass was subtracted from the head and from the foremost section of the neck from c1 to c3; light neck base, the base of the neck was assumed to remain elliptical with a width of three quarters of the height instead of becoming circular towards the base of the neck.