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Vertebra, Lumbar (Low Back)
These are the five vertebra of the lower back. The last vertebra (on the upper left of the picture) attaches to the sacrum, and the top vertebra (on the right of the picture) attaches to the thoracic section of the back. The vertebra are broader and stronger than the other bones in the spine. This allows them to absorb the added pressure applied to the lower back, but this area remains a common sight of injury. The vertebra are numbered from one to five and are labeled L1, L2, L3 etc. from the higher bones to the lower.
Vertebra, Thoracic (Mid Back)
These are twelve vertebra of the mid back. The last vertebra (on the left side of the picture) attaches to the lumbar (lower) spine, and the top vertebra (on the right) attaches to the cervical (neck) section of the back. The vertebra are broader and stronger than the cervical bones. This allows them to absorb the added pressure applied to the mid back, but they remain a common sight of injury. The vertebra are numbered from one to twelve and labeled T1, T2, T3 etc. from the upper most bones to the lowest.
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Spine Anatomy
Cervical Spine (Neck)
Thoracic Spine (Mid Back)
Lumbar Spine (Low Back)
Vertebrae
Inter-vertebral Disc
Facet Joints
Spinal Cord
The human spine is a complex structure that provides both mobility (so you can bend and twist) and stability (so you can remain upright all day). The normal spine has an "S"-like curve when looked at from the side. This curvature allows for even distribution of weight. The "S" curve helps a healthy spine withstand stress. Even though the lower portion of the spine holds most of the body's weight, each segment relies upon the strength of the others to function properly. Ultimately, this interdependence among all sections of the spine, plus the competing demands of mobility and stability make the spine vulnerable to injury and deterioration due to aging.
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