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 rotational movement, while the thoracic spine rotates with little flexion or extension. This is due to variation in _________.
A) the orientation of the superior and inferior articular facets
B) the arrangement of muscular attachment to the spinous processes
C) the thickness of the intervertebral disc
D) the composition of the intervertebral disks

Question

Quizplus · Accepted Answer

The orientation of the superior and inferior articular facets in the vertebral column determines the range and direction of movement. The lumbar spine has sagittal oriented facets, allowing for flexion and extension, but limiting rotation. The thoracic spine has coronal oriented facets, allowing for rotational movement, but limited flexion and extension.

The Range of Motion as Well as the Direction of Motion