atlas - allows you to tilt your head back to front (C-1), axis - allows you turn your head from side to side (C-2), cervical spine , supports the weight of the head, has the smallest vertebrae, is the most mobile, thoracic spine, has convex curve, vertebrae attach to the back of the ribs, helps protect the heart and lungs, lumbar spine, has five vertebrae, is the least mobile, supports the weight of the upper body, sacral spine, has five fused vertebrae, has concave curve, attached to the pelvis, distributes weight into the legs, coccyx , aka the tailbone, supports weight of upper body while we're seated.

The Spine

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