Lumbosacral Vertebrae

Unlike the thoracic wall, the bony support of the abdomen is minimal, consisting only of the lumbar vertebrae and portions of the pelvis (the ilium and the pubis).

■ There are five lumbar vertebrae, LI through L5.

• There are five sacral vertebrae, SI through S5, which are fused.

i 14 medical

Back and Nervous System

Cervical vertebrae

Sacrum (5)

Coccyx

Thoracic vertebrae (12)

Lumbar vertebrae

Lumbar curvature

Cervical curvature

Thoracic curvature

Figure 111-1-2

Anterior view

Lateral view Posterior view

Cervical vertebrae

Sacrum (5)

Coccyx

Thoracic curvature

Thoracic vertebrae (12)

Lumbar curvature

Lumbar vertebrae

Cervical curvature

Figure 111-1-2

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