What constitutes a spinal motion segment?: (A) A disc and the facet joints at that level., (B) A disc and the vertebrae above and below, including their interlocking facet joints., (C) A section of the spine involved in a physiological curve with the similar function (i.e. thoracic kyphosis)., (D) A vertebral body and the disc above.
Answer is B. Ans. B. A disc and the vertebrae above and below, including their interlocking facet joints.A spinal motion segment is made up of a disc with its adjacent vertebrae and their interlocking facet joints devoid of musculature