Page 79 - ASOP ROT Study Guide
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14 . 3 Lumbar
The lumbar region consists of five, although very occasionally six, vertebrae. It is a very mobile
section of the spine which permits a large amount of flexion and extension and some rotation. The
region carries relatively high loads and so it is very prone to injury and wearing diseases.
http://www.cliffsnotes.com/sciences/anatomy-and-physiology/the-skeletal-system/vertebral-column