The range of motion as well as the direction of motion for the various regions of the spine differs. For example the lumbar spine is capable of flexion and extension but little rotationalmovement. While the thoracic spine rotates with little flexion or extension. This is due tovariation in________.
A) the composition of the intervertebral disks
B) the orientation of the superior and inferior articular facets
C) the thickness of the intervertebral disc
D) the arrangement of muscular attachment to the spinous processes

Question

Quizplus · Accepted Answer

The orientation of the superior and inferior articular facets determines the range of motion for each region of the spine. The lumbar spine has vertically oriented facets which allow for flexion and extension but limit rotation, while the thoracic spine has horizontally oriented facets which allow for rotation but limit flexion and extension. The other choices do not directly affect the range or direction of motion for the spine.

The Range of Motion as Well as the Direction of Motion